fix: panel flashes when using virtual option in react (#916)

* fix: panel flashes when using virtual option in react

* chore: add comment for #915

Author: malangfox

packages/react-flicking/src/react-flicking/ReactRenderer.ts

@@ -28,9 +28,11 @@ class ReactRenderer extends ExternalRenderer {
     const reactFlicking = this._reactFlicking;
     const strategy = this._strategy;
 
+    // applyTransform does not work when renderer.rendering is true. #916
+    // updateRenderingPanels should be called before rendering becomes true, or transform will be applied later.
+    strategy.updateRenderingPanels(flicking);
     this._rendering = true;
 
-    strategy.updateRenderingPanels(flicking);
     strategy.renderPanels(flicking);
 
     return new Promise<void>(resolve => {