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
ctrl.getDisplay().asyncExec(new Runnable() {
				public void run() {
					selectReveal(selection, count + 1);
				}
			});
		}
	}
	private ISelection convertSelection(ISelection s) {
		if (!(s instanceof IStructuredSelection))
			return s;
			
		Object[] elements= ((StructuredSelection)s).toArray();
		if (!containsResources(elements))
			return s;
				
		for (int i= 0; i < elements.length; i++) {
			Object o= elements[i];
			if (o instanceof IResource) {
				IJavaElement jElement= JavaCore.create((IResource)o);
				if (jElement != null && jElement.exists()) 
					elements[i]= jElement;
			}
		}
		
		return new StructuredSelection(elements);
	}
	
	private boolean containsResources(Object[] elements) {
		for (int i = 0; i < elements.length; i++) {
			if (elements[i] instanceof IResource)