Bug 31214 [Show in] Fails for Package Explorer in non-Java project
- create a simple project P - create a simple file called "x.java" in P - open it with the Default Text Editor - in the editor activate "Show in" and select Package Explorer as target -> nothing happens even if P and "x.java" are visible in the Package Explorer
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
return PackagesMessages.getFormattedString("PackageExplorer.toolTip2", new String[] { result, fWorkingSetName }); 
	}
	
	public String getTitleToolTip() {
		if (fViewer == null)
			return super.getTitleToolTip();
		return getToolTipText(fViewer.getInput());
	}
	
	/**
	 * @see IWorkbenchPart#setFocus()
	 */
	public void setFocus() {
		fViewer.getTree().setFocus();
	}
	/**
	 * Returns the current selection.
	 */
	private ISelection getSelection() {
		return fViewer.getSelection();
	}
	  
	
	
	/**
	 * Called when the context menu is about to open. Override
	 * to add your own context dependent menu contributions.
	 */
	public void menuAboutToShow(IMenuManager menu) {
		JavaPlugin.createStandardGroups(menu);