Handles hidden by keyboard (#32838)

Extra space when scrolling to selected input so that the selection caret is visible.

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

diff --git a/packages/flutter/lib/src/widgets/editable_text.dart b/packages/flutter/lib/src/widgets/editable_text.dart
index 1c23e12..d1cf8af 100644
--- a/packages/flutter/lib/src/widgets/editable_text.dart
+++ b/packages/flutter/lib/src/widgets/editable_text.dart
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'dart:async';
+import 'dart:math' as math;
 import 'dart:ui' as ui;
 
 import 'package:flutter/foundation.dart';
@@ -1120,10 +1121,11 @@
 
     double scrollOffset = _scrollController.offset;
     final double viewportExtent = _scrollController.position.viewportDimension;
-    if (caretStart < 0.0) // cursor before start of bounds
+    if (caretStart < 0.0) { // cursor before start of bounds
       scrollOffset += caretStart;
-    else if (caretEnd >= viewportExtent) // cursor after end of bounds
+    } else if (caretEnd >= viewportExtent) { // cursor after end of bounds
       scrollOffset += caretEnd - viewportExtent;
+    }
     return scrollOffset;
   }
 
@@ -1271,12 +1273,32 @@
         curve: _caretAnimationCurve,
       );
       final Rect newCaretRect = _getCaretRectAtScrollOffset(_currentCaretRect, scrollOffsetForCaret);
-      // Enlarge newCaretRect by scrollPadding to ensure that caret is not positioned directly at the edge after scrolling.
+      // Enlarge newCaretRect by scrollPadding to ensure that caret is not
+      // positioned directly at the edge after scrolling.
+      double bottomSpacing = widget.scrollPadding.bottom;
+      if (_selectionOverlay?.selectionControls != null) {
+        final double handleHeight = _selectionOverlay.selectionControls
+          .getHandleSize(renderEditable.preferredLineHeight).height;
+        final double interactiveHandleHeight = math.max(
+          handleHeight,
+          kMinInteractiveSize,
+        );
+        final Offset anchor = _selectionOverlay.selectionControls
+          .getHandleAnchor(
+            TextSelectionHandleType.collapsed,
+            renderEditable.preferredLineHeight,
+          );
+        final double handleCenter = handleHeight / 2 - anchor.dy;
+        bottomSpacing = math.max(
+          handleCenter + interactiveHandleHeight / 2,
+          bottomSpacing,
+        );
+      }
       final Rect inflatedRect = Rect.fromLTRB(
           newCaretRect.left - widget.scrollPadding.left,
           newCaretRect.top - widget.scrollPadding.top,
           newCaretRect.right + widget.scrollPadding.right,
-          newCaretRect.bottom + widget.scrollPadding.bottom,
+          newCaretRect.bottom + bottomSpacing,
       );
       _editableKey.currentContext.findRenderObject().showOnScreen(
         rect: inflatedRect,

packages/flutter/test/cupertino/text_field_test.dart

diff --git a/packages/flutter/test/cupertino/text_field_test.dart b/packages/flutter/test/cupertino/text_field_test.dart
index 81bf06e..2989b48 100644
--- a/packages/flutter/test/cupertino/text_field_test.dart
+++ b/packages/flutter/test/cupertino/text_field_test.dart
@@ -2626,6 +2626,34 @@
     debugDefaultTargetPlatformOverride = null;
   });
 
+  testWidgets('when CupertinoTextField would be blocked by keyboard, it is shown with enough space for the selection handle', (WidgetTester tester) async {
+    final ScrollController scrollController = ScrollController();
+    final TextEditingController controller = TextEditingController();
+
+    await tester.pumpWidget(CupertinoApp(
+      theme: const CupertinoThemeData(),
+      home: Center(
+        child: ListView(
+          controller: scrollController,
+          children: <Widget>[
+            Container(height: 585), // Push field almost off screen.
+            CupertinoTextField(controller: controller),
+            Container(height: 1000),
+          ],
+        ),
+      ),
+    ));
+
+    // Tap the TextField to put the cursor into it and bring it into view.
+    expect(scrollController.offset, 0.0);
+    await tester.tap(find.byType(CupertinoTextField));
+    await tester.pumpAndSettle();
+
+    // The ListView has scrolled to keep the TextField and cursor handle
+    // visible.
+    expect(scrollController.offset, 26.0);
+  });
+
   testWidgets('disabled state golden', (WidgetTester tester) async {
     await tester.pumpWidget(
       CupertinoApp(

packages/flutter/test/material/text_field_test.dart

diff --git a/packages/flutter/test/material/text_field_test.dart b/packages/flutter/test/material/text_field_test.dart
index 8931b4e..22fede4 100644
--- a/packages/flutter/test/material/text_field_test.dart
+++ b/packages/flutter/test/material/text_field_test.dart
@@ -6581,4 +6581,34 @@
     await tester.tapAt(handlePos, pointer: 7);
     expect(editableText.selectionOverlay.toolbarIsVisible, isFalse);
   });
+
+  testWidgets('when TextField would be blocked by keyboard, it is shown with enough space for the selection handle', (WidgetTester tester) async {
+    final ScrollController scrollController = ScrollController();
+    final TextEditingController controller = TextEditingController();
+
+    await tester.pumpWidget(MaterialApp(
+      theme: ThemeData(),
+      home: Scaffold(
+        body: Center(
+          child: ListView(
+            controller: scrollController,
+            children: <Widget>[
+              Container(height: 579), // Push field almost off screen.
+              TextField(controller: controller),
+              Container(height: 1000),
+            ],
+          ),
+        ),
+      ),
+    ));
+
+    // Tap the TextField to put the cursor into it and bring it into view.
+    expect(scrollController.offset, 0.0);
+    await tester.tap(find.byType(TextField));
+    await tester.pumpAndSettle();
+
+    // The ListView has scrolled to keep the TextField and cursor handle
+    // visible.
+    expect(scrollController.offset, 44.0);
+  });
 }