Bug 299536 API refers to non-API type UIResourceFilterDescription
I20100112 CreateGroupOperation and CreateFolderOperation have constructors that require a UIResourceFilterDescription[]. However this is a non-API type, so clients can't reference it without using internals. Either the constructor should be removed or something like UIResourceFilterDescription needs to be promoted to API. Also, shouldn't CreateFolderOperation be renamed CreateVirtualFolderOperation?
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ResourceFilterGroup.java
try {
			gc.setFont(button.getFont());
			fontMetrics = gc.getFontMetrics();
		} finally {
			gc.dispose();
		}
		int widthHint = Dialog.convertHorizontalDLUsToPixels(fontMetrics,
				IDialogConstants.BUTTON_WIDTH);
		return Math.max(widthHint, button.computeSize(SWT.DEFAULT, SWT.DEFAULT,
				true).x);
	}
	/**
	 * Apply the default state of the resource.
	 */
	public void performDefaults() {
		if (resource == null)
			return;
		filters = new Filters(resource);
		filterView.setInput(filters);
		filterView.refresh();
	}
	/**
	 * @return the filters that were configured on this resource
	 */
	public UIResourceFilterDescription[] getFilters() {
		FilterCopy[] newFilters = filters.getChildren();
		UIResourceFilterDescription[] result = new UIResourceFilterDescription[newFilters.length];
		for (int i = 0; i < newFilters.length; i++) {
			result[i] = newFilters[i];
		}