Bug 64372 Projects showing up in Package Explorer twice [package explorer]
20040527-0800 When I load the platform-ui module and org.eclipse.tests from HEAD org.eclipse.tests is showing up twice in the PackageExplorer. This is not a a problem in the Resource Navigator. Open type only shows it once so it doesn't look like there are two instance in the workspace
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
super.inputChanged(input, oldInput);
			} finally {
				fInChangeInput= false;
			}
		}
		
		public void add(Object parentElement, Object[] childElements) {
			if (!fInChangeInput)
				super.add(parentElement, childElements);
		}
		
		public void remove(Object[] elements) {
			if (!fInChangeInput)
				super.remove(elements);
		}
		
		public void refresh(Object element, boolean updateLabels) {
			if (!fInChangeInput)
				super.refresh(element, updateLabels);
		}
		/*
		 * @see org.eclipse.jface.viewers.StructuredViewer#filter(java.lang.Object)
		 */
		protected Object[] getFilteredChildren(Object parent) {
			List list = new ArrayList();
			ViewerFilter[] filters = fViewer.getFilters();
			Object[] children = ((ITreeContentProvider) fViewer.getContentProvider()).getChildren(parent);
			for (int i = 0; i < children.length; i++) {
				Object object = children[i];
				if (!isEssential(object)) {