Toolbar should re-appear on drag end (#125165)

#125151 introduced the magnifier on touch drag gestures, but when showing the magnifier the toolbar is implicitly hidden, this change makes the toolbar re-appear on drag end for double tap + drag.

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

@@ -2850,6 +2850,10 @@ class TextSelectionGestureDetectorBuilder {
     final bool isShiftPressed = _containsShift(details.keysPressedOnDown);
     _dragBeganOnPreviousSelection = null;
 
+    if (_shouldShowSelectionToolbar && _TextSelectionGestureDetectorState._getEffectiveConsecutiveTapCount(details.consecutiveTapCount) == 2) {
+      editableText.showToolbar();
+    }
+
     if (isShiftPressed) {
       _dragStartSelection = null;
     }

packages/flutter/test/cupertino/text_field_test.dart

@@ -2245,8 +2245,15 @@ void main() {
       await gesture.moveTo(hPos);
       await tester.pumpAndSettle();
 
+      // Toolbar should be hidden during a drag.
+      expect(find.byType(CupertinoButton), findsNothing);
       expect(controller.selection.baseOffset, testValue.indexOf('d'));
       expect(controller.selection.extentOffset, testValue.indexOf('i') + 1);
+
+      // Toolbar should re-appear after a drag.
+      await gesture.up();
+      await tester.pump();
+      expect(find.byType(CupertinoButton), isContextMenuProvidedByPlatform ? findsNothing : findsNWidgets(4));
     },
   );
 

packages/flutter/test/material/text_field_test.dart

@@ -9396,8 +9396,15 @@ void main() {
       await gesture.moveTo(hPos);
       await tester.pumpAndSettle();
 
+      // Toolbar should be hidden during a drag.
+      expect(find.byType(TextButton), findsNothing);
       expect(controller.selection.baseOffset, testValue.indexOf('d'));
       expect(controller.selection.extentOffset, testValue.indexOf('i') + 1);
+
+      // Toolbar should re-appear after a drag.
+      await gesture.up();
+      await tester.pump();
+      expect(find.byType(TextButton), isContextMenuProvidedByPlatform ? findsNothing : findsNWidgets(4));
     },
   );