Port EditableText to Scrollable2 (#8167)

packages/flutter/lib/rendering.dart

@@ -28,7 +28,7 @@ export 'src/rendering/block.dart';
 export 'src/rendering/box.dart';
 export 'src/rendering/custom_layout.dart';
 export 'src/rendering/debug.dart';
-export 'src/rendering/editable_line.dart';
+export 'src/rendering/editable.dart';
 export 'src/rendering/error.dart';
 export 'src/rendering/flex.dart';
 export 'src/rendering/flow.dart';

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

@@ -147,7 +147,6 @@ class _InputFieldState extends State<InputField> {
               cursorColor: themeData.textSelectionColor,
               selectionColor: themeData.textSelectionColor,
               selectionControls: materialTextSelectionControls,
-              platform: Theme.of(context).platform,
               keyboardType: config.keyboardType,
               onChanged: config.onChanged,
               onSubmitted: config.onSubmitted,

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

@@ -184,13 +184,13 @@ class _RenderSingleChildViewport extends RenderBox with RenderObjectWithChildMix
   @override
   bool get isRepaintBoundary => true;
 
-  double get _effectiveExtent {
+  double get _viewportExtent {
     assert(hasSize);
     switch (axis) {
-      case Axis.vertical:
-        return size.height;
       case Axis.horizontal:
         return size.width;
+      case Axis.vertical:
+        return size.height;
     }
     return null;
   }
@@ -265,7 +265,7 @@ class _RenderSingleChildViewport extends RenderBox with RenderObjectWithChildMix
       size = constraints.constrain(child.size);
     }
 
-    offset.applyViewportDimension(_effectiveExtent);
+    offset.applyViewportDimension(_viewportExtent);
     offset.applyContentDimensions(_minScrollExtent, _maxScrollExtent);
   }
 

packages/flutter/test/widgets/input_test.dart

@@ -581,7 +581,6 @@ void main() {
     expect(inputValue.text, cutValue);
   }, skip: Platform.isMacOS); // Skip due to https://github.com/flutter/flutter/issues/6961
 
-
   testWidgets('Can scroll multiline input', (WidgetTester tester) async {
     GlobalKey inputKey = new GlobalKey();
     InputValue inputValue = InputValue.empty;
@@ -640,6 +639,7 @@ void main() {
     // Now the first line is scrolled up, and the fourth line is visible.
     Point newFirstPos = textOffsetToPosition(tester, kFourLines.indexOf('First'));
     Point newFourthPos = textOffsetToPosition(tester, kFourLines.indexOf('Fourth'));
+
     expect(newFirstPos.y, lessThan(firstPos.y));
     expect(inputBox.hitTest(new HitTestResult(), position: inputBox.globalToLocal(newFirstPos)), isFalse);
     expect(inputBox.hitTest(new HitTestResult(), position: inputBox.globalToLocal(newFourthPos)), isTrue);