Bug 32224 [Show In]Back-linking doesn't work for .class files in jars
Build 20030218 1. Enable back-linking in Package Explorer 2. Open Object (in rt.jar) Observe: An editor on Object.class opens (it shows the attached source). However Object.class is not shown in Package Explorer Note that Alt-Shift-s->Package Explorer doesn't work either.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
result= PackagesMessages.getString("PackageExplorer.title"); 
			} else {
				result= path.makeRelative().toString();
			}
		}
		
		if (fWorkingSetName == null)
			return result;
		String wsstr= PackagesMessages.getFormattedString("PackageExplorer.toolTip", new String[] { fWorkingSetName }); 
		if (result.length() == 0)
			return wsstr;
		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() {