Bug 55799 [Intro] When new welcome is available, don't show the old one
One of the M8 candidate builds (any): 1) Open Eclipse on a new workspace 2) Close the new Welcome when it opens 3) Close Eclipse 4) Open Eclipse again. Observe: the old Welcome editor is opened. Expectation: when a product has a valid Intro, old welcome should never be shown.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/WorkbenchActionBuilder.java
/**
	 * Disposes any resources and unhooks any listeners that are no longer needed.
	 * Called when the window is closed.
	 */
	public void dispose() {
		actionBarConfigurer.getStatusLineManager().remove(statusLineItem);
		if (prefListener != null) {
			ResourcesPlugin.getPlugin().getPluginPreferences().removePropertyChangeListener(
				prefListener);
		}
		closeAction.dispose();
		closeAllAction.dispose();
		closeAllSavedAction.dispose();
		saveAction.dispose();
		saveAllAction.dispose();
		aboutAction.dispose();
		openPreferencesAction.dispose();
		saveAsAction.dispose();
		hideShowEditorAction.dispose();
		savePerspectiveAction.dispose();
		resetPerspectiveAction.dispose();
		editActionSetAction.dispose();
		closePerspAction.dispose();
		lockToolBarAction.dispose();
		closeAllPerspsAction.dispose();
		showViewMenuAction.dispose();
		showPartPaneMenuAction.dispose();
		nextPartAction.dispose();
		prevPartAction.dispose();
		nextEditorAction.dispose();