Bug 32664 Package Explorer: hierarchical layout and back-linking don't work allways together.
The following triggers it: - initially 'flat layout' is used, 'link with editor' is on or off - open a java file - use 'collapse all' in the package explorer - select 'hierarchical layout' - switch 'link with editor' on or off&on -> no back-linking
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerContentProvider.java
}
		});
	 }
	/**
1	 * Process a resource delta.
	 * 
	 * @return true if the parent got refreshed
	 */
	private boolean processResourceDelta(IResourceDelta delta, Object parent) {
		int status= delta.getKind();
		int flags= delta.getFlags();
		
		IResource resource= delta.getResource();
		
		if (resource == null)
			return false;	
			
		
		if ((status & IResourceDelta.REMOVED) != 0) {
			if (parent instanceof IPackageFragment) {
				
				postRefresh(internalGetParent(parent));
				return true;
			} else 
				postRemove(resource);
		}
		if ((status & IResourceDelta.ADDED) != 0) {
			if (parent instanceof IPackageFragment) {
				
				postRefresh(internalGetParent(parent));