turn on `curly_braces_in_flow_control_structures` for develop-facing code (#105113)

analysis_options.yaml

@@ -98,7 +98,7 @@ linter:
     # - conditional_uri_does_not_exist # not yet tested
     # - constant_identifier_names # needs an opt-out https://github.com/dart-lang/linter/issues/204
     - control_flow_in_finally
-    # - curly_braces_in_flow_control_structures # not required by flutter style
+    # - curly_braces_in_flow_control_structures # not required by flutter style, but developer-facing code should have this on
     - depend_on_referenced_packages
     - deprecated_consistency
     # - diagnostic_describe_all_properties # enabled only at the framework level (packages/flutter/lib)

examples/api/analysis_options.yaml

@@ -4,5 +4,7 @@ include: ../../analysis_options.yaml
 
 linter:
   rules:
+    # Developer-facing code
+    curly_braces_in_flow_control_structures: true
     # Samples want to print things pretty often.
     avoid_print: false

packages/analysis_options.yaml

@@ -5,5 +5,6 @@ include: ../analysis_options.yaml
 
 linter:
   rules:
+    - curly_braces_in_flow_control_structures # Developer-facing code
     - public_member_api_docs # see https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#documentation-dartdocs-javadocs-etc
     - no_runtimeType_toString # use objectRuntimeType from package:foundation

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

@@ -212,9 +212,10 @@ class InkSparkle extends InteractiveInkFeature {
   }
 
   void _handleStatusChanged(AnimationStatus status) {
-    if (status == AnimationStatus.completed)
+    if (status == AnimationStatus.completed) {
       dispose();
     }
+  }
 
   static const Duration _animationDuration = Duration(milliseconds: 617);
   static const double _targetRadiusMultiplier = 2.3;

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

@@ -561,8 +561,9 @@ class _RenderInkFeatures extends RenderProxyBox implements MaterialInkController
 
   @visibleForTesting
   List<InkFeature>? get debugInkFeatures {
-    if (kDebugMode)
+    if (kDebugMode) {
       return _inkFeatures;
+    }
     return null;
   }
   List<InkFeature>? _inkFeatures;

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

@@ -56,8 +56,9 @@ class SelectionArea extends StatefulWidget {
 
 class _SelectionAreaState extends State<SelectionArea> {
   FocusNode get _effectiveFocusNode {
-    if (widget.focusNode != null)
+    if (widget.focusNode != null) {
       return widget.focusNode!;
+    }
     _internalNode ??= FocusNode();
     return _internalNode!;
   }

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

@@ -3054,10 +3054,11 @@ class _CompositeRenderEditablePainter extends RenderEditablePainter {
 
     final Iterator<RenderEditablePainter> oldPainters = oldDelegate.painters.iterator;
     final Iterator<RenderEditablePainter> newPainters = painters.iterator;
-    while (oldPainters.moveNext() && newPainters.moveNext())
+    while (oldPainters.moveNext() && newPainters.moveNext()) {
       if (newPainters.current.shouldRepaint(oldPainters.current)) {
         return true;
       }
+    }
 
     return false;
   }

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

@@ -408,10 +408,11 @@ class MouseTracker extends ChangeNotifier {
     // hit-test order.
     final PointerExitEvent baseExitEvent = PointerExitEvent.fromMouseEvent(latestEvent);
     lastAnnotations.forEach((MouseTrackerAnnotation annotation, Matrix4 transform) {
-      if (!nextAnnotations.containsKey(annotation))
+      if (!nextAnnotations.containsKey(annotation)) {
         if (annotation.validForMouseTracker && annotation.onExit != null) {
           annotation.onExit!(baseExitEvent.transformed(lastAnnotations[annotation]));
         }
+      }
     });
 
     // Send enter events to annotations that are not in last but in next, in

packages/flutter/test/widgets/selectable_region_test.dart

@@ -1292,8 +1292,9 @@ class RenderSelectAll extends RenderProxyBox
     ),
   );
   set value(SelectionGeometry other) {
-    if (other == _value)
+    if (other == _value) {
       return;
+    }
     _value = other;
     for (final VoidCallback callback in listeners) {
       callback();