feat: expand rich text to handle gestures.

(cherry picked from commit ce1eca28e1b9a5ef443f1123ac1b33d89efb6788)

frontend/app_flowy/packages/flowy_editor/lib/render/rich_text/flowy_rich_text.dart

@@ -129,7 +129,10 @@ class _FlowyRichTextState extends State<FlowyRichText> with Selectable {
   }
 
   Widget _buildRichText(BuildContext context) {
-    return _buildSingleRichText(context);
+    return Align(
+      alignment: Alignment.centerLeft,
+      child: _buildSingleRichText(context),
+    );
   }
 
   Widget _buildSingleRichText(BuildContext context) {