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
private FilterCopyTransfer() {
		}
		public void javaToNative(Object object, TransferData transferData) {
			if (object == null || !(object instanceof FilterCopy[]))
				return;
			if (isSupportedType(transferData)) {
				FilterCopy[] myTypes = (FilterCopy[]) object;
				try {
					ByteArrayOutputStream out = new ByteArrayOutputStream();
					DataOutputStream writeOut = new DataOutputStream(out);
					writeOut.writeInt(myTypes.length);
					for (int i = 0; i < myTypes.length; i++)
						writeOut.writeInt(myTypes[i].getSerialNumber());
					byte[] buffer = out.toByteArray();
					writeOut.close();
					super.javaToNative(buffer, transferData);
				} catch (IOException e) {
				}
			}
		}
		public Object nativeToJava(TransferData transferData) {
			if (isSupportedType(transferData)) {
				byte[] buffer = (byte[]) super.nativeToJava(transferData);
				if (buffer == null)
					return null;
				FilterCopy[] myData = new FilterCopy[0];
				try {
					ByteArrayInputStream in = new ByteArrayInputStream(buffer);
					DataInputStream readIn = new DataInputStream(in);