Bug 61878 Package explorer is filtering out plugin dependencies [package explorer]
Build 20040506 When expanding the Plug-in Dependencies container, it is counter-intuitive to hide project dependencies. These are shown in the build path wizard itself, when you expand this container. I would expect to see them all the time.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerContentProvider.java
Object parent= getParent(child);
		if (parent == null)
			return false;
		if (parent.equals(root))
			return true;
		return isParent(root, parent);
	}
	
	private void postRefresh(final Object root, final boolean updateLabels) {
		postRunnable(new Runnable() {
			public void run() {
				Control ctrl= fViewer.getControl();
				if (ctrl != null && !ctrl.isDisposed()){
					fViewer.refresh(root, updateLabels);
				}
			}
		});
	}
	private void postAdd(final Object parent, final Object element) {
		postRunnable(new Runnable() {
			public void run() {
				Control ctrl= fViewer.getControl();
				if (ctrl != null && !ctrl.isDisposed()){
					
					if (fViewer.testFindItem(element) == null) 
						fViewer.add(parent, element);
				}
			}
		});
	}