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/CommonViewer.java
/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.AbstractTreeViewer#setSelectionToWidget(java.util.List, boolean)
	 */
	protected void setSelectionToWidget(List v, boolean reveal) {
		clearSelectionCache();
		super.setSelectionToWidget(v, reveal);
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.AbstractTreeViewer#handleDoubleSelect(org.eclipse.swt.events.SelectionEvent)
	 */
	protected void handleDoubleSelect(SelectionEvent event) {
		clearSelectionCache();
		super.handleDoubleSelect(event);
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.StructuredViewer#handleOpen(org.eclipse.swt.events.SelectionEvent)
	 */
	protected void handleOpen(SelectionEvent event) {
		clearSelectionCache();
		super.handleOpen(event);
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.StructuredViewer#handlePostSelect(org.eclipse.swt.events.SelectionEvent)
	 */
	protected void handlePostSelect(SelectionEvent e) {
		clearSelectionCache();
		super.handlePostSelect(e);