fix missing spaces in adjacent strings (#49159)

dev/automated_tests/flutter_test/print_correct_local_widget_expectation.txt

 <<skip until matching line>>
 ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during layout:
-A RenderFlex overflowed by 2844 pixels on the right\.
+A RenderFlex overflowed by 2858 pixels on the right\.
 
 The relevant error-causing widget was:
   Row

dev/automated_tests/flutter_test/print_correct_local_widget_test.dart

@@ -26,7 +26,7 @@ void main() {
                   children: const <Widget>[
                     Text('Title'),
                     Text(
-                      'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed'
+                      'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed '
                       'do eiusmod tempor incididunt ut labore et dolore magna '
                       'aliqua. Ut enim ad minim veniam, quis nostrud '
                       'exercitation ullamco laboris nisi ut aliquip ex ea '

dev/benchmarks/microbenchmarks/lib/language/sync_star_semantics_bench.dart

@@ -11,7 +11,7 @@ const int _kNumWarmUp = 100;
 
 void main() {
   final List<String> words = 'Lorem Ipsum is simply dummy text of the printing and'
-    'typesetting industry. Lorem Ipsum has been the industry\'s'
+    ' typesetting industry. Lorem Ipsum has been the industry\'s'
     ' standard dummy text ever since the 1500s, when an unknown'
     ' printer took a galley of type and scrambled it to make a'
     ' type specimen book'.split(' ');

dev/devicelab/bin/run.dart

@@ -171,7 +171,7 @@ final ArgParser _argParser = ArgParser()
     defaultsTo: true,
     help: 'Only run tests that match the host platform (e.g. do not run a\n'
           'test with a `required_agent_capabilities` value of "mac/android"\n'
-          'on a windows host). Each test publishes its'
+          'on a windows host). Each test publishes its '
           '`required_agent_capabilities`\nin the `manifest.yaml` file.',
   )
   ..addOption(

dev/devicelab/bin/tasks/module_test.dart

@@ -220,7 +220,7 @@ Future<void> main() async {
           || !analyticsOutput.contains('cd25: true')
           || !analyticsOutput.contains('viewName: assemble')) {
         return TaskResult.failure(
-          'Building outer app produced the following analytics: "$analyticsOutput"'
+          'Building outer app produced the following analytics: "$analyticsOutput" '
           'but not the expected strings: "cd24: android", "cd25: true" and '
           '"viewName: assemble"'
         );

dev/devicelab/bin/tasks/module_test_ios.dart

@@ -285,7 +285,7 @@ Future<void> main() async {
           || !objectiveCAnalyticsOutput.contains('cd25: true')
           || !objectiveCAnalyticsOutput.contains('viewName: build/bundle')) {
         return TaskResult.failure(
-          'Building outer Objective-C app produced the following analytics: "$objectiveCAnalyticsOutput"'
+          'Building outer Objective-C app produced the following analytics: "$objectiveCAnalyticsOutput" '
           'but not the expected strings: "cd24: ios", "cd25: true", "viewName: build/bundle"'
         );
       }
@@ -374,7 +374,7 @@ Future<void> main() async {
           || !swiftAnalyticsOutput.contains('cd25: true')
           || !swiftAnalyticsOutput.contains('viewName: build/bundle')) {
         return TaskResult.failure(
-          'Building outer Swift app produced the following analytics: "$swiftAnalyticsOutput"'
+          'Building outer Swift app produced the following analytics: "$swiftAnalyticsOutput" '
           'but not the expected strings: "cd24: ios", "cd25: true", "viewName: build/bundle"'
         );
       }

dev/snippets/test/snippets_test.dart

@@ -132,8 +132,7 @@ void main() {
       expect(html, contains('<div>HTML Bits</div>'));
       expect(html, contains('<div>More HTML Bits</div>'));
       expect(html, contains('  print(&#39;The actual \$name.&#39;);'));
-      expect(html, contains('<div class="snippet-description">'
-          '{@end-inject-html}A description of the snippet.\n\n'
+      expect(html, contains('<div class="snippet-description">{@end-inject-html}A description of the snippet.\n\n'
           'On several lines.{@inject-html}</div>\n'));
       expect(html, contains('main() {'));
     });

dev/tools/gen_keycodes/bin/gen_keycodes.dart

@@ -102,7 +102,7 @@ Future<void> main(List<String> rawArguments) async {
   argParser.addOption(
     'code',
     defaultsTo: path.join(flutterRoot.path, 'packages', 'flutter', 'lib', 'src', 'services', 'keyboard_key.dart'),
-    help: 'The path to where the output "keyboard_keys.dart" file should be'
+    help: 'The path to where the output "keyboard_keys.dart" file should be '
         'written. If --code is not specified, the output will be written to the '
         'correct directory in the flutter tree. If the output directory does not '
         'exist, it, and the path to it, will be created.',
@@ -110,7 +110,7 @@ Future<void> main(List<String> rawArguments) async {
   argParser.addOption(
     'maps',
     defaultsTo: path.join(flutterRoot.path, 'packages', 'flutter', 'lib', 'src', 'services', 'keyboard_maps.dart'),
-    help: 'The path to where the output "keyboard_maps.dart" file should be'
+    help: 'The path to where the output "keyboard_maps.dart" file should be '
       'written. If --maps is not specified, the output will be written to the '
       'correct directory in the flutter tree. If the output directory does not '
       'exist, it, and the path to it, will be created.',

dev/tools/localization/gen_l10n.dart

@@ -544,7 +544,7 @@ String genPluralMethod(Map<String, dynamic> arbBundle, String resourceId) {
 }
 
 String genSupportedLocaleProperty(Set<LocaleInfo> supportedLocales) {
-  const String prefix = 'static const List<Locale> supportedLocales = <Locale>[\n    Locale(''';
+  const String prefix = 'static const List<Locale> supportedLocales = <Locale>[\n    Locale(';
   const String suffix = '),\n  ];';
 
   String resultingProperty = prefix;

dev/tools/vitool/lib/vitool.dart

@@ -87,8 +87,8 @@ class PathAnimation {
         final String currentCommandType = frame.paths[pathIdx].commands[commandIdx].type;
         if (commandType != currentCommandType)
           throw Exception(
-              'Paths must be built from the same commands in all frames'
-              'command $commandIdx at frame 0 was of type \'$commandType\''
+              'Paths must be built from the same commands in all frames '
+              'command $commandIdx at frame 0 was of type \'$commandType\' '
               'command $commandIdx at frame $i was of type \'$currentCommandType\''
           );
         for (int j = 0; j < numPointsInCommand; j += 1)

examples/flutter_gallery/lib/demo/fortnightly/fortnightly.dart

@@ -131,7 +131,7 @@ class FruitPage extends StatelessWidget {
                     ),
                     const SizedBox(height: 10),
                     Text(
-                      'How these crazy fruits sweetened our hearts, relationships,'
+                      'How these crazy fruits sweetened our hearts, relationships, '
                           'and puffed pastries',
                       style: textTheme.body1,
                     ),

examples/flutter_gallery/lib/demo/material/bottom_app_bar_demo.dart

@@ -90,7 +90,7 @@ class _BottomAppBarDemoState extends State<BottomAppBarDemo> {
   static void _showSnackbar() {
     const String text =
       "When the Scaffold's floating action button location changes, "
-      'the floating action button animates to its new position.'
+      'the floating action button animates to its new position. '
       'The BottomAppBar adapts its shape appropriately.';
     _scaffoldKey.currentState.showSnackBar(
       const SnackBar(content: Text(text)),

packages/flutter/lib/src/gestures/hit_test.dart

@@ -143,7 +143,7 @@ class HitTestResult {
       'The third row and third column of a transform matrix for pointer '
       'events must be Vector4(0, 0, 1, 0) to ensure that a transformed '
       'point is directly under the pointer device. Did you forget to run the paint '
-      'matrix through PointerEvent.removePerspectiveTransform?'
+      'matrix through PointerEvent.removePerspectiveTransform? '
       'The provided matrix is:\n$transform'
     );
     _transforms.add(_transforms.isEmpty ? transform : (transform * _transforms.last as Matrix4));

packages/flutter/lib/src/material/debug.dart

@@ -76,7 +76,7 @@ bool debugCheckHasMaterialLocalizations(BuildContext context) {
           'to be provided by a Localizations widget ancestor.'
         ),
         ErrorDescription(
-          'Localizations are used to generate many different messages, labels,'
+          'Localizations are used to generate many different messages, labels, '
           'and abbreviations which are used by the material library.'
         ),
         ErrorHint(

packages/flutter/lib/src/material/scaffold.dart

@@ -1755,7 +1755,7 @@ class ScaffoldState extends State<Scaffold> with TickerProviderStateMixin {
     assert(() {
       if (widget.bottomSheet != null && isPersistent && _currentBottomSheet != null) {
         throw FlutterError(
-          'Scaffold.bottomSheet cannot be specified while a bottom sheet'
+          'Scaffold.bottomSheet cannot be specified while a bottom sheet '
           'displayed with showBottomSheet() is still visible.\n'
           'Rebuild the Scaffold with a null bottomSheet before calling showBottomSheet().'
         );
@@ -1935,7 +1935,7 @@ class ScaffoldState extends State<Scaffold> with TickerProviderStateMixin {
     assert(() {
       if (widget.bottomSheet != null) {
         throw FlutterError(
-          'Scaffold.bottomSheet cannot be specified while a bottom sheet'
+          'Scaffold.bottomSheet cannot be specified while a bottom sheet '
           'displayed with showBottomSheet() is still visible.\n'
           'Rebuild the Scaffold with a null bottomSheet before calling showBottomSheet().'
         );

packages/flutter/lib/src/material/toggle_buttons.dart

@@ -566,7 +566,7 @@ class ToggleButtons extends StatelessWidget {
         return true;
       }(),
       'focusNodes.length must match children.length.\n'
-      'There are ${focusNodes.length} focus nodes, while'
+      'There are ${focusNodes.length} focus nodes, while '
       'there are ${children.length} children.'
     );
     final ThemeData theme = Theme.of(context);

packages/flutter/lib/src/rendering/sliver.dart

@@ -503,19 +503,20 @@ class SliverConstraints extends Constraints {
 
   @override
   String toString() {
-    return 'SliverConstraints('
-             '$axisDirection, '
-             '$growthDirection, '
-             '$userScrollDirection, '
-             'scrollOffset: ${scrollOffset.toStringAsFixed(1)}, '
-             'remainingPaintExtent: ${remainingPaintExtent.toStringAsFixed(1)}, ' +
-             (overlap != 0.0 ? 'overlap: ${overlap.toStringAsFixed(1)}, ' : '') +
-             'crossAxisExtent: ${crossAxisExtent.toStringAsFixed(1)}, '
-             'crossAxisDirection: $crossAxisDirection, '
-             'viewportMainAxisExtent: ${viewportMainAxisExtent.toStringAsFixed(1)}, '
-             'remainingCacheExtent: ${remainingCacheExtent.toStringAsFixed(1)} '
-             'cacheOrigin: ${cacheOrigin.toStringAsFixed(1)} '
-           ')';
+    final List<String> properties = <String>[
+      '$axisDirection',
+      '$growthDirection',
+      '$userScrollDirection',
+      'scrollOffset: ${scrollOffset.toStringAsFixed(1)}',
+      'remainingPaintExtent: ${remainingPaintExtent.toStringAsFixed(1)}',
+      if (overlap != 0.0) 'overlap: ${overlap.toStringAsFixed(1)}',
+      'crossAxisExtent: ${crossAxisExtent.toStringAsFixed(1)}',
+      'crossAxisDirection: $crossAxisDirection',
+      'viewportMainAxisExtent: ${viewportMainAxisExtent.toStringAsFixed(1)}',
+      'remainingCacheExtent: ${remainingCacheExtent.toStringAsFixed(1)}',
+      'cacheOrigin: ${cacheOrigin.toStringAsFixed(1)}',
+    ];
+    return 'SliverConstraints(${properties.join(', ')})';
   }
 }
 

packages/flutter/lib/src/rendering/sliver_fill.dart

@@ -163,9 +163,9 @@ class RenderSliverFillRemaining extends RenderSliverSingleBoxAdapter {
     }
 
     assert(extent.isFinite,
-      'The calculated extent for the child of SliverFillRemaining is not finite.'
-      'This can happen if the child is a scrollable, in which case, the'
-      'hasScrollBody property of SliverFillRemaining should not be set to'
+      'The calculated extent for the child of SliverFillRemaining is not finite. '
+      'This can happen if the child is a scrollable, in which case, the '
+      'hasScrollBody property of SliverFillRemaining should not be set to '
       'false.',
     );
     final double paintedChildSize = calculatePaintOffset(constraints, from: 0.0, to: extent);
@@ -239,9 +239,9 @@ class RenderSliverFillRemainingAndOverscroll extends RenderSliverSingleBoxAdapte
     }
 
     assert(extent.isFinite,
-      'The calculated extent for the child of SliverFillRemaining is not finite.'
-      'This can happen if the child is a scrollable, in which case, the'
-      'hasScrollBody property of SliverFillRemaining should not be set to'
+      'The calculated extent for the child of SliverFillRemaining is not finite. '
+      'This can happen if the child is a scrollable, in which case, the '
+      'hasScrollBody property of SliverFillRemaining should not be set to '
       'false.',
     );
     final double paintedChildSize = calculatePaintOffset(constraints, from: 0.0, to: extent);

packages/flutter/lib/src/rendering/sliver_grid.dart

@@ -71,12 +71,13 @@ class SliverGridGeometry {
 
   @override
   String toString() {
-    return 'SliverGridGeometry('
-      'scrollOffset: $scrollOffset, '
-      'crossAxisOffset: $crossAxisOffset, '
-      'mainAxisExtent: $mainAxisExtent, '
-      'crossAxisExtent: $crossAxisExtent'
-    ')';
+    final List<String> properties = <String>[
+      'scrollOffset: $scrollOffset',
+      'crossAxisOffset: $crossAxisOffset',
+      'mainAxisExtent: $mainAxisExtent',
+      'crossAxisExtent: $crossAxisExtent',
+    ];
+    return 'SliverGridGeometry(${properties.join(', ')})';
   }
 }
 

packages/flutter/lib/src/rendering/viewport.dart

@@ -1270,7 +1270,7 @@ class RenderViewport extends RenderViewportBase<SliverPhysicalContainerParentDat
               throw FlutterError.fromParts(<DiagnosticsNode>[
                 ErrorSummary('Horizontal viewport was given unbounded width.'),
                 ErrorDescription(
-                  'Viewports expand in the scrolling direction to fill their container.'
+                  'Viewports expand in the scrolling direction to fill their container. '
                   'In this case, a horizontal viewport was given an unlimited amount of '
                   'horizontal space in which to expand. This situation typically happens '
                   'when a scrollable widget is nested inside another scrollable widget.'

packages/flutter/lib/src/widgets/automatic_keep_alive.dart

@@ -145,7 +145,7 @@ class _AutomaticKeepAliveState extends State<AutomaticKeepAlive> {
       assert(() {
         if (!mounted) {
           throw FlutterError(
-            'AutomaticKeepAlive handle triggered after AutomaticKeepAlive was disposed.'
+            'AutomaticKeepAlive handle triggered after AutomaticKeepAlive was disposed. '
             'Widgets should always trigger their KeepAliveNotification handle when they are '
             'deactivated, so that they (or their handle) do not send spurious events later '
             'when they are no longer in the tree.'

packages/flutter/lib/src/widgets/media_query.dart

@@ -574,22 +574,23 @@ class MediaQueryData {
 
   @override
   String toString() {
-    return '${objectRuntimeType(this, 'MediaQueryData')}('
-             'size: $size, '
-             'devicePixelRatio: ${devicePixelRatio.toStringAsFixed(1)}, '
-             'textScaleFactor: ${textScaleFactor.toStringAsFixed(1)}, '
-             'platformBrightness: $platformBrightness, '
-             'padding: $padding, '
-             'viewPadding: $viewPadding, '
-             'viewInsets: $viewInsets, '
-             'physicalDepth: $physicalDepth, '
-             'alwaysUse24HourFormat: $alwaysUse24HourFormat, '
-             'accessibleNavigation: $accessibleNavigation, '
-             'highContrast: $highContrast,'
-             'disableAnimations: $disableAnimations, '
-             'invertColors: $invertColors, '
-             'boldText: $boldText'
-           ')';
+    final List<String> properties = <String>[
+      'size: $size',
+      'devicePixelRatio: ${devicePixelRatio.toStringAsFixed(1)}',
+      'textScaleFactor: ${textScaleFactor.toStringAsFixed(1)}',
+      'platformBrightness: $platformBrightness',
+      'padding: $padding',
+      'viewPadding: $viewPadding',
+      'viewInsets: $viewInsets',
+      'physicalDepth: $physicalDepth',
+      'alwaysUse24HourFormat: $alwaysUse24HourFormat',
+      'accessibleNavigation: $accessibleNavigation',
+      'highContrast: $highContrast',
+      'disableAnimations: $disableAnimations',
+      'invertColors: $invertColors',
+      'boldText: $boldText',
+    ];
+    return '${objectRuntimeType(this, 'MediaQueryData')}(${properties.join(', ')})';
   }
 }
 

packages/flutter/test/cupertino/tab_scaffold_test.dart

@@ -724,7 +724,7 @@ void main() {
       expect(tabsPainted, const <int> [0, 0, 1]);
   });
 
-  testWidgets('Do not call dispose on a controller that we do not own'
+  testWidgets('Do not call dispose on a controller that we do not own '
               'but do remove from its listeners when done listening to it',
     (WidgetTester tester) async {
       final MockCupertinoTabController mockController = MockCupertinoTabController(initialIndex: 0);
@@ -798,7 +798,7 @@ void main() {
     expect(find.text('Tab 3'), findsNothing);
   });
 
-  testWidgets('A controller can control more than one CupertinoTabScaffold,'
+  testWidgets('A controller can control more than one CupertinoTabScaffold, '
     'removal of listeners does not break the controller',
     (WidgetTester tester) async {
       final List<int> tabsPainted0 = <int>[];

packages/flutter/test/material/debug_test.dart

@@ -68,7 +68,7 @@ void main() {
       '   BackButton widgets require MaterialLocalizations to be provided\n'
       '   by a Localizations widget ancestor.\n'
       '   Localizations are used to generate many different messages,\n'
-      '   labels,and abbreviations which are used by the material library.\n'
+      '   labels, and abbreviations which are used by the material library.\n'
       '   To introduce a MaterialLocalizations, either use a MaterialApp at\n'
       '   the root of your application to include them automatically, or\n'
       '   add a Localization widget with a MaterialLocalizations delegate.\n'

packages/flutter/test/material/expansion_panel_test.dart

@@ -649,7 +649,7 @@ void main() {
   });
 
   testWidgets(
-    'didUpdateWidget accounts for toggling between ExpansionPanelList'
+    'didUpdateWidget accounts for toggling between ExpansionPanelList '
     'and ExpansionPaneList.radio',
     (WidgetTester tester) async {
       bool isRadioList = false;

packages/flutter/test/material/scaffold_test.dart

@@ -1720,8 +1720,8 @@ void main() {
           expect(error, isNotNull);
           expect(error.toStringDeep(), equalsIgnoringHashCodes(
             'FlutterError\n'
-            '   Scaffold.bottomSheet cannot be specified while a bottom\n'
-            '   sheetdisplayed with showBottomSheet() is still visible.\n'
+            '   Scaffold.bottomSheet cannot be specified while a bottom sheet\n'
+            '   displayed with showBottomSheet() is still visible.\n'
             '   Rebuild the Scaffold with a null bottomSheet before calling\n'
             '   showBottomSheet().\n',
           ));

packages/flutter/test/material/toggle_buttons_test.dart

@@ -228,7 +228,7 @@ void main() {
             ),
           ),
         );
-        fail('Should not be possible to create a toggle button with mismatching'
+        fail('Should not be possible to create a toggle button with mismatching '
             'children.length and isSelected.length.');
       } on AssertionError catch (e) {
         expect(e.toString(), contains('children.length'));

packages/flutter/test/rendering/layer_annotations_test.dart

@@ -491,7 +491,7 @@ void main() {
     );
   });
 
-  test('AnnotatedRegionLayer.findAllAnnotations should still check children and return'
+  test('AnnotatedRegionLayer.findAllAnnotations should still check children and return '
     'children\'s opacity (false) during a failed hit', () {
     const Offset position = Offset(5, 5);
 
@@ -513,7 +513,7 @@ void main() {
     );
   });
 
-  test('AnnotatedRegionLayer.findAllAnnotations should still check children and return'
+  test('AnnotatedRegionLayer.findAllAnnotations should still check children and return '
     'children\'s opacity (true) during a failed hit', () {
     const Offset position = Offset(5, 5);
 

packages/flutter/test/rendering/slivers_test.dart

@@ -92,8 +92,8 @@ void main() {
         ' │ │   GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n'
         ' │ │   0.0, remainingPaintExtent: 600.0, crossAxisExtent: 800.0,\n'
         ' │ │   crossAxisDirection: AxisDirection.right,\n'
-        ' │ │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0\n'
-        ' │ │   cacheOrigin: 0.0 )\n'
+        ' │ │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0,\n'
+        ' │ │   cacheOrigin: 0.0)\n'
         ' │ │ geometry: SliverGeometry(scrollExtent: 400.0, paintExtent: 400.0,\n'
         ' │ │   maxPaintExtent: 400.0, cacheExtent: 400.0)\n'
         ' │ │\n'
@@ -108,8 +108,8 @@ void main() {
         ' │ │   GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n'
         ' │ │   0.0, remainingPaintExtent: 200.0, crossAxisExtent: 800.0,\n'
         ' │ │   crossAxisDirection: AxisDirection.right,\n'
-        ' │ │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 450.0\n'
-        ' │ │   cacheOrigin: 0.0 )\n'
+        ' │ │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 450.0,\n'
+        ' │ │   cacheOrigin: 0.0)\n'
         ' │ │ geometry: SliverGeometry(scrollExtent: 400.0, paintExtent: 200.0,\n'
         ' │ │   maxPaintExtent: 400.0, hasVisualOverflow: true, cacheExtent:\n'
         ' │ │   400.0)\n'
@@ -125,8 +125,8 @@ void main() {
         ' │ │   GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n'
         ' │ │   0.0, remainingPaintExtent: 0.0, crossAxisExtent: 800.0,\n'
         ' │ │   crossAxisDirection: AxisDirection.right,\n'
-        ' │ │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 50.0\n'
-        ' │ │   cacheOrigin: 0.0 )\n'
+        ' │ │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 50.0,\n'
+        ' │ │   cacheOrigin: 0.0)\n'
         ' │ │ geometry: SliverGeometry(scrollExtent: 400.0, hidden,\n'
         ' │ │   maxPaintExtent: 400.0, hasVisualOverflow: true, cacheExtent:\n'
         ' │ │   50.0)\n'
@@ -142,8 +142,8 @@ void main() {
         ' │ │   GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n'
         ' │ │   0.0, remainingPaintExtent: 0.0, crossAxisExtent: 800.0,\n'
         ' │ │   crossAxisDirection: AxisDirection.right,\n'
-        ' │ │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 0.0\n'
-        ' │ │   cacheOrigin: 0.0 )\n'
+        ' │ │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 0.0,\n'
+        ' │ │   cacheOrigin: 0.0)\n'
         ' │ │ geometry: SliverGeometry(scrollExtent: 400.0, hidden,\n'
         ' │ │   maxPaintExtent: 400.0, hasVisualOverflow: true)\n'
         ' │ │\n'
@@ -158,8 +158,8 @@ void main() {
         '   │   GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n'
         '   │   0.0, remainingPaintExtent: 0.0, crossAxisExtent: 800.0,\n'
         '   │   crossAxisDirection: AxisDirection.right,\n'
-        '   │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 0.0\n'
-        '   │   cacheOrigin: 0.0 )\n'
+        '   │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 0.0,\n'
+        '   │   cacheOrigin: 0.0)\n'
         '   │ geometry: SliverGeometry(scrollExtent: 400.0, hidden,\n'
         '   │   maxPaintExtent: 400.0, hasVisualOverflow: true)\n'
         '   │\n'
@@ -956,7 +956,7 @@ void main() {
         '  The "precedingScrollExtent" is NaN, expected greater than or equal to zero.\n'
         '  The constraints are not normalized.\n'
         'The offending constraints were:\n'
-        '  SliverConstraints(AxisDirection.down, GrowthDirection.forward, ScrollDirection.idle, scrollOffset: NaN, remainingPaintExtent: NaN, overlap: NaN, crossAxisExtent: NaN, crossAxisDirection: AxisDirection.left, viewportMainAxisExtent: NaN, remainingCacheExtent: NaN cacheOrigin: NaN )',
+        '  SliverConstraints(AxisDirection.down, GrowthDirection.forward, ScrollDirection.idle, scrollOffset: NaN, remainingPaintExtent: NaN, overlap: NaN, crossAxisExtent: NaN, crossAxisDirection: AxisDirection.left, viewportMainAxisExtent: NaN, remainingCacheExtent: NaN, cacheOrigin: NaN)',
       );
       threw = true;
     }
@@ -992,7 +992,7 @@ void main() {
         '  The "precedingScrollExtent" is negative.\n'
         '  The constraints are not normalized.\n'
         'The offending constraints were:\n'
-        '  SliverConstraints(AxisDirection.down, GrowthDirection.forward, ScrollDirection.idle, scrollOffset: -1.0, remainingPaintExtent: -1.0, crossAxisExtent: 0.0, crossAxisDirection: AxisDirection.left, viewportMainAxisExtent: 0.0, remainingCacheExtent: -1.0 cacheOrigin: 1.0 )',
+        '  SliverConstraints(AxisDirection.down, GrowthDirection.forward, ScrollDirection.idle, scrollOffset: -1.0, remainingPaintExtent: -1.0, crossAxisExtent: 0.0, crossAxisDirection: AxisDirection.left, viewportMainAxisExtent: 0.0, remainingCacheExtent: -1.0, cacheOrigin: 1.0)',
       );
       threw = true;
     }

packages/flutter/test/rendering/viewport_test.dart

@@ -1047,7 +1047,7 @@ void main() {
           'FlutterError\n'
           '   Horizontal viewport was given unbounded width.\n'
           '   Viewports expand in the scrolling direction to fill their\n'
-          '   container.In this case, a horizontal viewport was given an\n'
+          '   container. In this case, a horizontal viewport was given an\n'
           '   unlimited amount of horizontal space in which to expand. This\n'
           '   situation typically happens when a scrollable widget is nested\n'
           '   inside another scrollable widget.\n'

packages/flutter/test/widgets/keep_alive_test.dart

@@ -299,8 +299,8 @@ void main() {
       '                       │   GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n'
       '                       │   0.0, remainingPaintExtent: 600.0, crossAxisExtent: 800.0,\n'
       '                       │   crossAxisDirection: AxisDirection.right,\n'
-      '                       │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0\n'
-      '                       │   cacheOrigin: 0.0 )\n'
+      '                       │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0,\n'
+      '                       │   cacheOrigin: 0.0)\n'
       '                       │ geometry: SliverGeometry(scrollExtent: 40000.0, paintExtent:\n'
       '                       │   600.0, maxPaintExtent: 40000.0, hasVisualOverflow: true,\n'
       '                       │   cacheExtent: 850.0)\n'
@@ -446,8 +446,8 @@ void main() {
       '                       │   GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n'
       '                       │   2000.0, remainingPaintExtent: 600.0, crossAxisExtent: 800.0,\n'
       '                       │   crossAxisDirection: AxisDirection.right,\n'
-      '                       │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 1100.0\n'
-      '                       │   cacheOrigin: -250.0 )\n'
+      '                       │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 1100.0,\n'
+      '                       │   cacheOrigin: -250.0)\n'
       '                       │ geometry: SliverGeometry(scrollExtent: 40000.0, paintExtent:\n'
       '                       │   600.0, maxPaintExtent: 40000.0, hasVisualOverflow: true,\n'
       '                       │   cacheExtent: 1100.0)\n'

packages/flutter/test/widgets/list_view_viewporting_test.dart

@@ -335,8 +335,8 @@ void main() {
         ' │   GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n'
         ' │   0.0, remainingPaintExtent: 600.0, crossAxisExtent: 800.0,\n'
         ' │   crossAxisDirection: AxisDirection.right,\n'
-        ' │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0\n'
-        ' │   cacheOrigin: 0.0 )\n'
+        ' │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0,\n'
+        ' │   cacheOrigin: 0.0)\n'
         ' │ geometry: SliverGeometry(scrollExtent: 300.0, paintExtent: 300.0,\n'
         ' │   maxPaintExtent: 300.0, cacheExtent: 300.0)\n'
         ' │ currently live children: 0 to 2\n'

packages/flutter/test/widgets/sliver_fill_viewport_test.dart

@@ -72,8 +72,8 @@ void main() {
         ' │   GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n'
         ' │   0.0, remainingPaintExtent: 600.0, crossAxisExtent: 800.0,\n'
         ' │   crossAxisDirection: AxisDirection.right,\n'
-        ' │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0\n'
-        ' │   cacheOrigin: 0.0 )\n'
+        ' │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0,\n'
+        ' │   cacheOrigin: 0.0)\n'
         ' │ geometry: SliverGeometry(scrollExtent: 12000.0, paintExtent:\n'
         ' │   600.0, maxPaintExtent: 12000.0, hasVisualOverflow: true,\n'
         ' │   cacheExtent: 850.0)\n'
@@ -85,8 +85,8 @@ void main() {
         '   │   GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n'
         '   │   0.0, remainingPaintExtent: 600.0, crossAxisExtent: 800.0,\n'
         '   │   crossAxisDirection: AxisDirection.right,\n'
-        '   │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0\n'
-        '   │   cacheOrigin: 0.0 )\n'
+        '   │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0,\n'
+        '   │   cacheOrigin: 0.0)\n'
         '   │ geometry: SliverGeometry(scrollExtent: 12000.0, paintExtent:\n'
         '   │   600.0, maxPaintExtent: 12000.0, hasVisualOverflow: true,\n'
         '   │   cacheExtent: 850.0)\n'

packages/flutter/test/widgets/slivers_appbar_pinned_test.dart

@@ -90,8 +90,8 @@ void main() {
         ' │   GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n'
         ' │   0.0, remainingPaintExtent: 600.0, crossAxisExtent: 800.0,\n'
         ' │   crossAxisDirection: AxisDirection.right,\n'
-        ' │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0\n'
-        ' │   cacheOrigin: 0.0 )\n'
+        ' │   viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0,\n'
+        ' │   cacheOrigin: 0.0)\n'
         ' │ geometry: SliverGeometry(scrollExtent: 200.0, paintExtent: 200.0,\n'
         ' │   maxPaintExtent: 200.0, hasVisualOverflow: true, cacheExtent:\n'
         ' │   200.0)\n'

packages/flutter/test/widgets/text_test.dart

@@ -772,8 +772,7 @@ void main() {
                 // Each word takes up more than a half of a line. Together they
                 // wrap onto two lines, but leave a lot of extra space.
                 child: Text(
-                  'twowordsthateachtakeupmorethanhalfof alineoftextsothattheywr'
-                    'apwithlotsofextraspace',
+                  'twowordsthateachtakeupmorethanhalfof alineoftextsothattheywrapwithlotsofextraspace',
                   textDirection: TextDirection.ltr,
                   textWidthBasis: textWidthBasis,
                 ),

packages/flutter_driver/lib/src/driver/vmservice_driver.dart

@@ -220,7 +220,7 @@ class VMServiceFlutterDriver extends FlutterDriver {
           rethrow;
         }
         _log(
-            'Check Health failed, try to wait for the service extensions to be'
+            'Check Health failed, try to wait for the service extensions to be '
                 'registered.'
         );
         await enableIsolateStreams();

packages/flutter_test/lib/src/test_async_utils.dart

@@ -195,16 +195,17 @@ class TestAsyncUtils {
     final _StackEntry originalGuarder = _findResponsibleMethod(scope.creationStack, 'guard', information);
     final _StackEntry collidingGuarder = _findResponsibleMethod(StackTrace.current, 'guardSync', information);
     if (originalGuarder != null && collidingGuarder != null) {
+      final String originalKind = originalGuarder.className == null ? 'function' : 'method';
       String originalName;
       if (originalGuarder.className == null) {
-        originalName = '(${originalGuarder.methodName}) ';
+        originalName = '$originalKind (${originalGuarder.methodName})';
         information.add(ErrorDescription(
           'The guarded "${originalGuarder.methodName}" function '
           'was called from ${originalGuarder.callerFile} '
           'on line ${originalGuarder.callerLine}.'
         ));
       } else {
-        originalName = '(${originalGuarder.className}.${originalGuarder.methodName}) ';
+        originalName = '$originalKind (${originalGuarder.className}.${originalGuarder.methodName})';
         information.add(ErrorDescription(
           'The guarded method "${originalGuarder.methodName}" '
           'from class ${originalGuarder.className} '
@@ -215,25 +216,26 @@ class TestAsyncUtils {
       final String again = (originalGuarder.callerFile == collidingGuarder.callerFile) &&
                            (originalGuarder.callerLine == collidingGuarder.callerLine) ?
                            'again ' : '';
+      final String collidingKind = collidingGuarder.className == null ? 'function' : 'method';
       String collidingName;
       if ((originalGuarder.className == collidingGuarder.className) &&
           (originalGuarder.methodName == collidingGuarder.methodName)) {
-        originalName = '';
-        collidingName = '';
+        originalName = originalKind;
+        collidingName = collidingKind;
         information.add(ErrorDescription(
           'Then, it '
           'was called ${again}from ${collidingGuarder.callerFile} '
           'on line ${collidingGuarder.callerLine}.'
         ));
       } else if (collidingGuarder.className == null) {
-        collidingName = '(${collidingGuarder.methodName}) ';
+        collidingName = '$collidingKind (${collidingGuarder.methodName})';
         information.add(ErrorDescription(
           'Then, the "${collidingGuarder.methodName}" function '
           'was called ${again}from ${collidingGuarder.callerFile} '
           'on line ${collidingGuarder.callerLine}.'
         ));
       } else {
-        collidingName = '(${collidingGuarder.className}.${collidingGuarder.methodName}) ';
+        collidingName = '$collidingKind (${collidingGuarder.className}.${collidingGuarder.methodName})';
         information.add(ErrorDescription(
           'Then, the "${collidingGuarder.methodName}" method '
           '${originalGuarder.className == collidingGuarder.className ? "(also from class ${collidingGuarder.className})"
@@ -243,9 +245,9 @@ class TestAsyncUtils {
         ));
       }
       information.add(ErrorDescription(
-        'The first ${originalGuarder.className == null ? "function" : "method"} $originalName'
+        'The first $originalName '
         'had not yet finished executing at the time that '
-        'the second ${collidingGuarder.className == null ? "function" : "method"} $collidingName'
+        'the second $collidingName '
         'was called. Since both are guarded, and the second was not a nested call inside the first, the '
         'first must complete its execution before the second can be called. Typically, this is achieved by '
         'putting an "await" statement in front of the call to the first.'
@@ -259,9 +261,7 @@ class TestAsyncUtils {
         ));
       }
       information.add(DiagnosticsStackTrace(
-        '\nWhen the first ${originalGuarder.className == null ? "function" : "method"} '
-        '$originalName'
-        'was called, this was the stack',
+        '\nWhen the first $originalName was called, this was the stack',
         scope.creationStack,
       ));
     }

packages/flutter_test/test/controller_test.dart

@@ -23,7 +23,7 @@ class TestDragData {
 
 void main() {
   testWidgets(
-    'WidgetTester.drag must break the offset into multiple parallel components if'
+    'WidgetTester.drag must break the offset into multiple parallel components if '
     'the drag goes outside the touch slop values',
     (WidgetTester tester) async {
       // This test checks to make sure that the total drag will be correctly split into

packages/flutter_tools/lib/src/android/gradle.dart

@@ -642,7 +642,7 @@ ${globals.terminal.bolden('Consuming the Module')}
 ''');
   }
 
-  globals.printStatus('To learn more, visit https://flutter.dev/go/build-aar''');
+  globals.printStatus('To learn more, visit https://flutter.dev/go/build-aar');
 }
 
 String _hex(List<int> bytes) {
@@ -877,7 +877,7 @@ String _getLocalArtifactVersion(String pomPath) {
     );
   } on FileSystemException {
     throwToolExit(
-      'Error reading $pomPath. Please ensure that you have read permission to this'
+      'Error reading $pomPath. Please ensure that you have read permission to this '
       'file and try again.');
   }
   final Iterable<xml.XmlElement> project = document.findElements('project');

packages/flutter_tools/lib/src/android/gradle_errors.dart

@@ -236,8 +236,7 @@ final GradleHandledError licenseNotAcceptedHandler = GradleHandledError(
     bool shouldBuildPluginAsAar,
   }) async {
     const String licenseNotAcceptedMatcher =
-      r'You have not accepted the license agreements of the following SDK components:'
-      r'\s*\[(.+)\]';
+      r'You have not accepted the license agreements of the following SDK components:\s*\[(.+)\]';
 
     final RegExp licenseFailure = RegExp(licenseNotAcceptedMatcher, multiLine: true);
     assert(licenseFailure != null);

packages/flutter_tools/lib/src/codegen.dart

@@ -110,7 +110,7 @@ class CodeGeneratingKernelCompiler implements KernelCompiler {
     List<String> dartDefines,
   }) async {
     if (fileSystemRoots != null || fileSystemScheme != null || depFilePath != null || targetModel != null || sdkRoot != null || packagesPath != null) {
-      globals.printTrace('fileSystemRoots, fileSystemScheme, depFilePath, targetModel,'
+      globals.printTrace('fileSystemRoots, fileSystemScheme, depFilePath, targetModel, '
         'sdkRoot, packagesPath are not supported when using the experimental '
         'build* pipeline');
     }

packages/flutter_tools/lib/src/commands/build_aar.dart

@@ -47,7 +47,7 @@ class BuildAarCommand extends BuildSubCommand {
       )
       ..addOption(
         'output-dir',
-        help: 'The absolute path to the directory where the repository is generated.'
+        help: 'The absolute path to the directory where the repository is generated. '
               'By default, this is \'<current-directory>android/build\'. ',
       );
   }

packages/flutter_tools/lib/src/commands/build_web.dart

@@ -28,7 +28,7 @@ class BuildWebCommand extends BuildSubCommand {
     argParser.addFlag('csp',
       defaultsTo: false,
       negatable: false,
-      help: 'Disable dynamic generation of code in the generated output.'
+      help: 'Disable dynamic generation of code in the generated output. '
         'This is necessary to satisfy CSP restrictions (see http://www.w3.org/TR/CSP/).'
     );
   }

packages/flutter_tools/lib/src/commands/create.dart

@@ -857,8 +857,10 @@ String _validateProjectDir(String dirPath, { String flutterRoot, bool overwrite
   // If the destination directory is actually a file, then we refuse to
   // overwrite, on the theory that the user probably didn't expect it to exist.
   if (globals.fs.isFileSync(dirPath)) {
-    return "Invalid project name: '$dirPath' - refers to an existing file."
-        '${overwrite ? ' Refusing to overwrite a file with a directory.' : ''}';
+    final String message = "Invalid project name: '$dirPath' - refers to an existing file.";
+    return overwrite
+      ? '$message Refusing to overwrite a file with a directory.'
+      : message;
   }
 
   if (overwrite) {

packages/flutter_tools/lib/src/commands/ide_config.dart

@@ -52,7 +52,7 @@ class IdeConfigCommand extends FlutterCommand {
       'missing. If --overwrite is specified, will revert existing files to '
       'the template versions, reset the module list, and return configuration '
       'settings to the template versions.\n\n'
-      'This command is intended for Flutter developers to help them set up the'
+      'This command is intended for Flutter developers to help them set up the '
       "Flutter tree for development in an IDE. It doesn't affect other projects.\n\n"
       'Currently, IntelliJ is the default (and only) IDE that may be configured.';
 

packages/flutter_tools/lib/src/commands/screenshot.dart

@@ -32,7 +32,7 @@ class ScreenshotCommand extends FlutterCommand {
       valueHelp: 'URI',
       help: 'The observatory URI to connect to.\n'
           'This is required when --$_kType is "$_kSkiaType" or "$_kRasterizerType".\n'
-          'To find the observatory URI, use "flutter run" and look for'
+          'To find the observatory URI, use "flutter run" and look for '
           '"An Observatory ... is available at" in the output.',
     );
     argParser.addOption(

packages/flutter_tools/lib/src/commands/update_packages.dart

@@ -61,7 +61,7 @@ class UpdatePackagesCommand extends FlutterCommand {
       )
       ..addFlag(
         'consumer-only',
-        help: 'Only prints the dependency graph that is the transitive closure'
+        help: 'Only prints the dependency graph that is the transitive closure '
               'that a consumer of the Flutter SDK will observe (When combined '
               'with transitive-closure)',
         defaultsTo: false,

packages/flutter_tools/lib/src/commands/upgrade.dart

@@ -163,8 +163,8 @@ class UpgradeCommandRunner {
     } on ProcessException catch (error) {
       throwToolExit(
         'The tool could not verify the status of the current flutter checkout. '
-        'This might be due to git not being installed or an internal error.'
-        'If it is okay to ignore potential local changes, then re-run this'
+        'This might be due to git not being installed or an internal error. '
+        'If it is okay to ignore potential local changes, then re-run this '
         'command with --force.'
         '\nError: $error.'
       );
@@ -212,7 +212,7 @@ class UpgradeCommandRunner {
     } on ProcessException catch (error) {
       throwToolExit(
         'Unable to upgrade Flutter: The tool could not update to the version $tag. '
-        'This may be due to git not being installed or an internal error.'
+        'This may be due to git not being installed or an internal error. '
         'Please ensure that git is installed on your computer and retry again.'
         '\nError: $error.'
       );

packages/flutter_tools/lib/src/commands/version.dart

@@ -74,8 +74,8 @@ class VersionCommand extends FlutterCommand {
     if (targetVersion < minSupportedVersion) {
       if (!boolArg('force')) {
         globals.printError(
-          'Version command is not supported in $targetVersion and it is supported since version $minSupportedVersion'
-          'which means if you switch to version $minSupportedVersion then you can not use version command.'
+          'Version command is not supported in $targetVersion and it is supported since version $minSupportedVersion '
+          'which means if you switch to version $minSupportedVersion then you can not use version command. '
           'If you really want to switch to version $targetVersion, please use `--force` flag: `flutter version --force $targetVersion`.'
         );
         return const FlutterCommandResult(ExitStatus.success);

packages/flutter_tools/lib/src/convert.dart

@@ -40,7 +40,7 @@ class Utf8Decoder extends cnv.Utf8Decoder {
     if (reportErrors && result.contains('\u{FFFD}')) {
       throwToolExit(
         'Bad UTF-8 encoding found while decoding string: $result. '
-        'The Flutter team would greatly appreciate if you could file a bug or leave a'
+        'The Flutter team would greatly appreciate if you could file a bug or leave a '
         'comment on the issue https://github.com/flutter/flutter/issues/15646.\n'
         'The source bytes were:\n$codeUnits\n\n');
     }

packages/flutter_tools/lib/src/ios/bitcode.dart

@@ -38,7 +38,7 @@ Future<void> validateBitcode(BuildMode buildMode, TargetPlatform targetPlatform)
     throwToolExit(
       'The Flutter.framework at $flutterFrameworkPath was built '
       'with "${engineClangVersion ?? 'unknown'}", but the current version '
-      'of clang is "$clangVersion". This will result in failures when trying to'
+      'of clang is "$clangVersion". This will result in failures when trying to '
       'archive an IPA. To resolve this issue, update your version of Xcode to '
       'at least $engineClangSemVer.',
     );

packages/flutter_tools/lib/src/mdns_discovery.dart

@@ -195,7 +195,7 @@ class MDnsObservatoryDiscovery {
           'The mDNS query for an attached iOS device failed. It may '
           'be necessary to disable the "Personal Hotspot" on the device, and '
           'to ensure that the "Disable unless needed" setting is unchecked '
-          'under System Preferences > Network > iPhone USB.'
+          'under System Preferences > Network > iPhone USB. '
           'See https://github.com/flutter/flutter/issues/46698 for details.'
         );
         break;

packages/flutter_tools/lib/src/plugins.dart

@@ -187,8 +187,8 @@ class Plugin {
 
     if (usesOldPluginFormat && usesNewPluginFormat) {
       const String errorMessage =
-          'The flutter.plugin.platforms key cannot be used in combination with the old'
-          'flutter.plugin.{androidPackage,iosPrefix,pluginClass} keys.'
+          'The flutter.plugin.platforms key cannot be used in combination with the old '
+          'flutter.plugin.{androidPackage,iosPrefix,pluginClass} keys. '
           'See: https://flutter.dev/docs/development/packages-and-plugins/developing-packages#plugin';
       return <String>[errorMessage];
     }

packages/flutter_tools/lib/src/runner/flutter_command.dart

@@ -229,7 +229,7 @@ abstract class FlutterCommand extends Command<void> {
   /// Adds options for connecting to the Dart VM observatory port.
   void usesPortOptions() {
     argParser.addOption(observatoryPortOption,
-        help: '(deprecated use host-vmservice-port instead)'
+        help: '(deprecated use host-vmservice-port instead) '
               'Listen to the given port for an observatory debugger connection.\n'
               'Specifying port 0 (the default) will find a random free port.',
     );
@@ -368,11 +368,11 @@ abstract class FlutterCommand extends Command<void> {
     argParser.addFlag('shrink',
       negatable: true,
       defaultsTo: true,
-      help: 'Whether to enable code shrinking on release mode.'
+      help: 'Whether to enable code shrinking on release mode. '
             'When enabling shrinking, you also benefit from obfuscation, '
             'which shortens the names of your app’s classes and members, '
             'and optimization, which applies more aggressive strategies to '
-            'further reduce the size of your app.'
+            'further reduce the size of your app. '
             'To learn more, see: https://developer.android.com/studio/build/shrink-code',
       );
   }

packages/flutter_tools/test/general.shard/commands/build_aot_test.dart

@@ -150,7 +150,7 @@ void main() {
       validateBitcode(BuildMode.release, TargetPlatform.ios),
       equals('The Flutter.framework at ios_profile/Flutter.framework was built with "Apple LLVM version 10.0.1 '
              '(clang-1234.1.12.1)", but the current version of clang is "Apple LLVM version 10.0.0 (clang-4567.1.1.1)". '
-             'This will result in failures when trying toarchive an IPA. To resolve this issue, update your version '
+             'This will result in failures when trying to archive an IPA. To resolve this issue, update your version '
              'of Xcode to at least 10.0.1.'),
     );
   }, overrides: <Type, Generator>{