Bug 168757 [KeyBindings] Add keybinding for 'collapse all' button in Navigator & Package Explorer
Just a nice to have - would be very handy to assign something like CTRL-minus to the 'collapse all' button in Navigator and Package Explorer views (really, anything w/ a tree view and than button).
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/CommonNavigatorActionGroup.java
private CollapseAllAction collapseAllAction;
	private FilterActionGroup filterGroup;
	private final CommonViewer commonViewer;
	private CommonNavigator commonNavigator;
	private final LinkHelperService linkHelperService;
	/**
	 * Create a action group for Collapse All, Link with editor, and Select
	 * Filters.
	 * 
	 * @param aNavigator
	 *            The IViewPart for this action group
	 * @param aViewer
	 *            The Viewer for this action group
	 * @param linkHelperService the link service helper
	 */
	public CommonNavigatorActionGroup(CommonNavigator aNavigator,
			CommonViewer aViewer, LinkHelperService linkHelperService) {
		super();
		commonNavigator = aNavigator;
		commonViewer = aViewer;
		this.linkHelperService = linkHelperService;
		makeActions();
	}
	/**
	 * Returns the image descriptor with the given relative path.
	 */
	protected final ImageDescriptor getImageDescriptor(String relativePath) {
		return NavigatorPlugin.getImageDescriptor("icons/full/" + relativePath); 
	}
	/**