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
fileToolBar.add(saveAction);
            fileToolBar
                    .add(new GroupMarker(IWorkbenchActionConstants.SAVE_EXT));
            fileToolBar.add(getPrintItem());
            fileToolBar
                    .add(new GroupMarker(IWorkbenchActionConstants.PRINT_EXT));
            fileToolBar
                    .add(new Separator(IWorkbenchActionConstants.BUILD_GROUP));
            fileToolBar
                    .add(new GroupMarker(IWorkbenchActionConstants.BUILD_EXT));
            fileToolBar.add(new Separator(
                    IWorkbenchActionConstants.MB_ADDITIONS));
            
            coolBar.add(actionBarConfigurer.createToolBarContributionItem(fileToolBar,
                    IWorkbenchActionConstants.TOOLBAR_FILE));
        }
        coolBar.add(new GroupMarker(IWorkbenchActionConstants.MB_ADDITIONS));
        coolBar.add(new GroupMarker(IIDEActionConstants.GROUP_NAV));
        { 
            IToolBarManager navToolBar = actionBarConfigurer.createToolBarManager();
            navToolBar.add(new Separator(
                    IWorkbenchActionConstants.HISTORY_GROUP));
            navToolBar
                    .add(new GroupMarker(IWorkbenchActionConstants.GROUP_APP));
            navToolBar.add(backwardHistoryAction);
            navToolBar.add(forwardHistoryAction);
            navToolBar.add(new Separator(IWorkbenchActionConstants.PIN_GROUP));
            navToolBar.add(pinEditorContributionItem);
            
            coolBar.add(actionBarConfigurer.createToolBarContributionItem(navToolBar,