Fix confusing typo: extent vs. extend selection (#106002)

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

@@ -1482,40 +1482,40 @@ class RenderEditable extends RenderBox with RelayoutWhenSystemFontsChangeMixin,
     _setSelection(selection, SelectionChangedCause.keyboard);
   }
 
-  void _handleMoveCursorForwardByCharacter(bool extentSelection) {
+  void _handleMoveCursorForwardByCharacter(bool extendSelection) {
     assert(selection != null);
     final int? extentOffset = _textPainter.getOffsetAfter(selection!.extentOffset);
     if (extentOffset == null) {
       return;
     }
-    final int baseOffset = !extentSelection ? extentOffset : selection!.baseOffset;
+    final int baseOffset = !extendSelection ? extentOffset : selection!.baseOffset;
     _setSelection(
       TextSelection(baseOffset: baseOffset, extentOffset: extentOffset),
       SelectionChangedCause.keyboard,
     );
   }
 
-  void _handleMoveCursorBackwardByCharacter(bool extentSelection) {
+  void _handleMoveCursorBackwardByCharacter(bool extendSelection) {
     assert(selection != null);
     final int? extentOffset = _textPainter.getOffsetBefore(selection!.extentOffset);
     if (extentOffset == null) {
       return;
     }
-    final int baseOffset = !extentSelection ? extentOffset : selection!.baseOffset;
+    final int baseOffset = !extendSelection ? extentOffset : selection!.baseOffset;
     _setSelection(
       TextSelection(baseOffset: baseOffset, extentOffset: extentOffset),
       SelectionChangedCause.keyboard,
     );
   }
 
-  void _handleMoveCursorForwardByWord(bool extentSelection) {
+  void _handleMoveCursorForwardByWord(bool extendSelection) {
     assert(selection != null);
     final TextRange currentWord = _textPainter.getWordBoundary(selection!.extent);
     final TextRange? nextWord = _getNextWord(currentWord.end);
     if (nextWord == null) {
       return;
     }
-    final int baseOffset = extentSelection ? selection!.baseOffset : nextWord.start;
+    final int baseOffset = extendSelection ? selection!.baseOffset : nextWord.start;
     _setSelection(
       TextSelection(
         baseOffset: baseOffset,
@@ -1525,14 +1525,14 @@ class RenderEditable extends RenderBox with RelayoutWhenSystemFontsChangeMixin,
     );
   }
 
-  void _handleMoveCursorBackwardByWord(bool extentSelection) {
+  void _handleMoveCursorBackwardByWord(bool extendSelection) {
     assert(selection != null);
     final TextRange currentWord = _textPainter.getWordBoundary(selection!.extent);
     final TextRange? previousWord = _getPreviousWord(currentWord.start - 1);
     if (previousWord == null) {
       return;
     }
-    final int baseOffset = extentSelection ?  selection!.baseOffset : previousWord.start;
+    final int baseOffset = extendSelection ?  selection!.baseOffset : previousWord.start;
     _setSelection(
       TextSelection(
         baseOffset: baseOffset,

packages/flutter/lib/src/semantics/semantics.dart

@@ -3534,8 +3534,8 @@ class SemanticsConfiguration {
   set onMoveCursorForwardByCharacter(MoveCursorHandler? value) {
     assert(value != null);
     _addAction(SemanticsAction.moveCursorForwardByCharacter, (Object? args) {
-      final bool extentSelection = args! as bool;
-      value!(extentSelection);
+      final bool extendSelection = args! as bool;
+      value!(extendSelection);
     });
     _onMoveCursorForwardByCharacter = value;
   }
@@ -3552,8 +3552,8 @@ class SemanticsConfiguration {
   set onMoveCursorBackwardByCharacter(MoveCursorHandler? value) {
     assert(value != null);
     _addAction(SemanticsAction.moveCursorBackwardByCharacter, (Object? args) {
-      final bool extentSelection = args! as bool;
-      value!(extentSelection);
+      final bool extendSelection = args! as bool;
+      value!(extendSelection);
     });
     _onMoveCursorBackwardByCharacter = value;
   }
@@ -3570,8 +3570,8 @@ class SemanticsConfiguration {
   set onMoveCursorForwardByWord(MoveCursorHandler? value) {
     assert(value != null);
     _addAction(SemanticsAction.moveCursorForwardByWord, (Object? args) {
-      final bool extentSelection = args! as bool;
-      value!(extentSelection);
+      final bool extendSelection = args! as bool;
+      value!(extendSelection);
     });
     _onMoveCursorForwardByCharacter = value;
   }
@@ -3588,8 +3588,8 @@ class SemanticsConfiguration {
   set onMoveCursorBackwardByWord(MoveCursorHandler? value) {
     assert(value != null);
     _addAction(SemanticsAction.moveCursorBackwardByWord, (Object? args) {
-      final bool extentSelection = args! as bool;
-      value!(extentSelection);
+      final bool extendSelection = args! as bool;
+      value!(extendSelection);
     });
     _onMoveCursorBackwardByCharacter = value;
   }