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
Object arguments = null;
	String id = null;
	IPath path = null;
	IProject project = null;
	int type = 0;
	FilterCopy parent = null;
	LinkedList children = null;
	UIResourceFilterDescription original = null;
	int serialNumber = ++lastSerialNumber;
	static private int lastSerialNumber = 0;
	public FilterCopy(UIResourceFilterDescription filter) {
		internalCopy(filter);
		original = filter;
	}
	public void setParent(FilterCopy parent) {
		this.parent = parent;
	}
	public boolean canAcceptDrop() {
		int limit = getChildrenLimit();
		if (limit > 0) {
			FilterCopy[] tmp = getChildren();
			return (tmp == null) || (tmp.length < limit);
		}
		return false;