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
protected TreeViewer fViewer;
	protected Object fInput;
	private boolean fIsFlatLayout;
	private PackageFragmentProvider fPackageFragmentProvider= new PackageFragmentProvider();
	
	/**
	 * Creates a new content provider for Java elements.
	 */
	public PackageExplorerContentProvider() {
	}
	/**
	 * Creates a new content provider for Java elements.
	 */
	public PackageExplorerContentProvider(boolean provideMembers, boolean provideWorkingCopy) {
		super(provideMembers, provideWorkingCopy);	
	}
	
	/* (non-Javadoc)