Support flutter dev/master channel

lib/widgets/raw_editor.dart

@@ -1033,7 +1033,7 @@ class RawEditorState extends EditorState
   }
 
   @override
-  void hideToolbar() {
+  void hideToolbar([bool hideHandles = true]) {
     if (getSelectionOverlay()?.toolbar != null) {
       getSelectionOverlay()?.hideToolbar();
     }
@@ -1135,6 +1135,10 @@ class RawEditorState extends EditorState
       closeConnectionIfNeeded();
     }
   }
+
+  @override
+  void userUpdateTextEditingValue(
+      TextEditingValue value, SelectionChangedCause cause) {}
 }
 
 class _Editor extends MultiChildRenderObjectWidget {

lib/widgets/text_selection.dart

@@ -156,10 +156,13 @@ class EditorTextSelectionOverlay {
       default:
         throw 'Invalid position';
     }
-    selectionDelegate
-      ..textEditingValue =
-          value.copyWith(selection: newSelection, composing: TextRange.empty)
-      ..bringIntoView(textPosition);
+
+    selectionDelegate.userUpdateTextEditingValue(
+      value.copyWith(selection: newSelection, composing: TextRange.empty),
+      SelectionChangedCause.drag,
+    );
+
+    selectionDelegate.bringIntoView(textPosition);
   }
 
   Widget _buildToolbar(BuildContext context) {