(flutter) use scheduleFrameCallback to invoke requestFrame to match Flutter/vsync

thermion_flutter/thermion_flutter/lib/thermion/widgets/thermion_widget.dart

@@ -56,10 +56,19 @@ class _ThermionWidgetState extends State<ThermionWidget> {
       if (mounted) {
         setState(() {});
       }
+
+      _requestFrame();
     });
     super.initState();
   }
 
+  void _requestFrame() {
+    WidgetsBinding.instance.scheduleFrameCallback((d) {
+      widget.viewer.requestFrame();
+      _requestFrame();
+    });
+  }
+
   bool _resizing = false;
   Timer? _resizeTimer;