Bug 85452 [IDE] (regression) Backdrop missing when all perspectives closed
I20050215-2300 - close all perspectives - the main page is blank - it should have a backdrop with text and button explaining how to open a perspective
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/IDEWorkbenchWindowAdvisor.java
IPerspectiveRegistry reg = getWorkbench()
                        .getPerspectiveRegistry();
                IPerspectiveDescriptor desc = reg
                        .findPerspectiveWithId(perspectiveId);
                if (desc != null) {
                    page.setPerspective(desc);
                }
            }
            
            window.setActivePage(page);
            page.openEditor(new WelcomeEditorInput(
                    welcomePerspectiveInfos[index]),
                    WELCOME_EDITOR_ID, true);
        }
    }
    /**
     * Tries to open the intro, if one exists and otherwise will open the legacy 
     * Welcome pages.
     * 
     * @see org.eclipse.ui.application.WorkbenchWindowAdvisor#openIntro()
     */
    public void openIntro() {
        if (editorsAndIntrosOpened )
            return;
        editorsAndIntrosOpened = true;
        
        if (wbAdvisor.hasIntro())
            super.openIntro();
        else {
            openWelcomeEditors(getWindowConfigurer().getWindow());