Added fix for cursor appearing below highlights

frontend/app_flowy/lib/workspace/presentation/stack_page/doc/doc_page.dart

@@ -98,6 +98,7 @@ class _DocPageState extends State<DocPage> {
       controller: controller,
       focusNode: _focusNode,
       scrollable: true,
+      paintCursorAboveText: true,
       autoFocus: controller.document.isEmpty(),
       expands: false,
       padding: const EdgeInsets.symmetric(horizontal: 8.0),