Bug 67814 Show In > Package Explorer doesn't ask for removal of last filter [package explorer]
200406180010; Not a dup of 66646. 'Show In > Package Explorer' doesn't ask for removal of a filter iff there's only a single filter set. Steps: - Disable all filters in Package Explorer, except for 'Referenced Libraries'. - Open editor for java.util.Vector - Navigate > Show In > Package Explorer => fails, doesn't ask for filter removal. Works iff at least one other filter (which would not filter the element) is active.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/CustomFiltersActionGroup.java
* @param viewer	the viewer to be filtered
	 */
	public CustomFiltersActionGroup(IViewPart part, StructuredViewer viewer) {
		this(part.getViewSite().getId(), viewer);
	}
	/**
	 * Creates a new <code>CustomFiltersActionGroup</code>.
	 * 
	 * @param ownerId	the id of this action group's owner
	 * @param viewer	the viewer to be filtered
	 */
	public CustomFiltersActionGroup(String ownerId, StructuredViewer viewer) {
		Assert.isNotNull(ownerId);
		Assert.isNotNull(viewer);
		fTargetId= ownerId;
		fViewer= viewer;
		fLRUFilterIdsStack= new Stack();
		initializeWithPluginContributions();
		initializeWithViewDefaults();
		
		installFilters();
	}
	
	/*
	 * Method declared on ActionGroup.
	 */
	public void fillActionBars(IActionBars actionBars) {
		fillToolBar(actionBars.getToolBarManager());
		fillViewMenu(actionBars.getMenuManager());
	}