Bug 275171 [Contributions] Customize Perspective action breaks editor pinning action
Using M7, I enabled editor pinning (i.e. Reuse editor) and pinned an editor using an action in the toolbar. I then disabled editor pinning ad then opened the customized perspective dialog. After this, enabling/disabling editor pinning does not make the Pin Editor action reappear.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/WorkbenchActionBuilder.java
private IWorkbenchAction closeAllSavedAction;
    private IWorkbenchAction saveAction;
    private IWorkbenchAction saveAllAction;
    private IWorkbenchAction newWindowAction;
    
    private IWorkbenchAction newEditorAction;
    private IWorkbenchAction helpContentsAction;
    private IWorkbenchAction helpSearchAction;
	
    private IWorkbenchAction dynamicHelpAction;
    
    private IWorkbenchAction aboutAction;
    private IWorkbenchAction openPreferencesAction;
    private IWorkbenchAction saveAsAction;
    private IWorkbenchAction hideShowEditorAction;
    private IWorkbenchAction savePerspectiveAction;
    private IWorkbenchAction resetPerspectiveAction;
    private IWorkbenchAction editActionSetAction;
    private IWorkbenchAction closePerspAction;
    private IWorkbenchAction lockToolBarAction;
    private IWorkbenchAction closeAllPerspsAction;
    private IWorkbenchAction showViewMenuAction;
    private IWorkbenchAction showPartPaneMenuAction;
    private IWorkbenchAction nextPartAction;
    private IWorkbenchAction prevPartAction;
    private IWorkbenchAction nextEditorAction;
    private IWorkbenchAction prevEditorAction;
    private IWorkbenchAction nextPerspectiveAction;
    private IWorkbenchAction prevPerspectiveAction;
    private IWorkbenchAction activateEditorAction;