Bug 89625 [IDE] IDEWorkbenchWindowAdvisor refers to workbench internals for backdrop
3.1 M5 The code in IDEWorkbenchWindowAdvisor to provide the backdrop when all perspectives are closed refers to internal workbench classes: import org.eclipse.ui.internal.IWorkbenchGraphicConstants; import org.eclipse.ui.internal.WorkbenchImages; import org.eclipse.ui.internal.dialogs.SelectPerspectiveDialog; This should be done using only API.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/IDEWorkbenchWindowAdvisor.java
*/
    private void openWelcomeEditor(IWorkbenchWindow window,
            WelcomeEditorInput input, String perspectiveId) {
        if (getWorkbench().getWorkbenchWindowCount() == 0) {
            
            
            return;
        }
        IWorkbenchWindow win = window;
        if (perspectiveId != null) {
            try {
                win = getWorkbench().openWorkbenchWindow(perspectiveId,
                        wbAdvisor.getDefaultPageInput());
                if (win == null) {
                    win = window;
                }
            } catch (WorkbenchException e) {
                IDEWorkbenchPlugin
                        .log(
                                "Error opening window with welcome perspective.", e.getStatus()); 
                return;
            }
        }
        if (win == null) {
            win = getWorkbench().getWorkbenchWindows()[0];
        }
        IWorkbenchPage page = win.getActivePage();
        String id = perspectiveId;
        if (id == null) {
            id = getWorkbench().getPerspectiveRegistry()