clear transition of data-testid="Content" element

src/client/js/components/Sidebar.jsx

@@ -94,6 +94,7 @@ class Sidebar extends React.Component {
       // clear transition temporary when restore collapsed sidebar
       if (this.sidebarCollapsedCached) {
         this.clearNavigationTransitionTemporary(this.ctxNavigationElem);
+        this.clearNavigationTransitionTemporary(this.contentElem);
       }
 
       navigationUIController.enableResize();
@@ -113,6 +114,10 @@ class Sidebar extends React.Component {
     return document.querySelector('div[data-testid="ContextualNavigation"]');
   }
 
+  get contentElem() {
+    return document.querySelector('div[data-testid="Content"]');
+  }
+
   clearNavigationTransitionTemporary(elem) {
     const transitionCache = elem.style.transition;