Bug 189490 [CommonNavigator] Go To->Resource won't enable
I0524 1. Open the Project Explorer in the Resource perspective 2. Create a vanilla project P 3. Create a folder F 4. Create a file resource R Open the Navigate->Go To file. "Resource..." will remain disabled.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonNavigator.java
Object input = commonViewer.getInput();
		String viewName = getConfigurationElement().getAttribute("name");  
		
		if (input == null) {
			setPartName(viewName);
			setTitleToolTip("");  
		} else {
			String inputToolTip = getFrameToolTipText(input);
			setPartName(viewName);
			setTitleToolTip(inputToolTip);
		}
	}
	/**
	 * <p>
	 * Returns the tool tip text for the given element. Used as the tool tip
	 * text for the current frame, and for the view title tooltip.
	 * </p>
	 */
	protected String getFrameToolTipText(Object anElement) {
		if (commonViewer != null) {
			return ((ILabelProvider) commonViewer.getLabelProvider())
					.getText(anElement);
		}
		return ""; 
	}
	/* (non-Javadoc)
	 * @see org.eclipse.ui.ISaveablesSource#getSaveables()
	 */
	public Saveable[] getSaveables() {
		return getNavigatorContentService().getSaveablesService().getSaveables();