Bug 25768 Package Explorer flashes too much on refresh and delete
build I20021105 - extracted a zip containing 22 non-Java files (.mxsd files from Dejan) into org.eclipse.ui - in Package Explorer, refreshed org.eclipse.ui - it flashed alot while refreshing - selected the 22 files and deleted them - it flashed even more
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerContentProvider.java
if (affectedChildren.length > 1) {
			
			postRefresh(resource);
			return;
		}
		for (int i= 0; i < affectedChildren.length; i++)
			processResourceDelta(affectedChildren[i], resource);
	}
	
	private void postRefresh(final Object root) {
		postRunnable(new Runnable() {
			public void run() {
				
				Control ctrl= fViewer.getControl();
				if (ctrl != null && !ctrl.isDisposed()){
					ctrl.setRedraw(false); 
					fViewer.refresh(root);
					ctrl.setRedraw(true);
				}
			}
		});
	}
	
	private void postAdd(final Object parent, final Object element) {
		postRunnable(new Runnable() {
			public void run() {
				
				Control ctrl= fViewer.getControl();
				if (ctrl != null && !ctrl.isDisposed()){