Bug 297184 [Wizards] [resource filters] New file wizard should not allow to create files that are excluded by resource filter
Build : I20091207-1800 If the user creates a new file from the "File | New..." wizard that is actually filtered out by its parent resource filters, it will show up just after creation, but it will disappear from the resource tree when the user manually refreshes the view. 1) The PE should either not show this file, and hide it from the view if it is filtered, or show a different icon for such files. 2) The wizard should show a warning that the created file is already filtered.
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/dialogs/WizardNewFolderMainPage.java
* does nothing if the container resources already exist.
	 * <p>
	 * In normal usage, this method is invoked after the user has pressed Finish
	 * on the wizard; the enablement of the Finish button implies that all
	 * controls on this page currently contain valid values.
	 * </p>
	 * <p>
	 * Note that this page caches the new folder once it has been successfully
	 * created; subsequent invocations of this method will answer the same
	 * folder resource without attempting to create it again.
	 * </p>
	 * <p>
	 * This method should be called within a workspace modify operation since it
	 * creates resources.
	 * </p>
	 * 
	 * @return the created folder resource, or <code>null</code> if the folder
	 *         was not created
	 */
	public IFolder createNewFolder() {
		if (newFolder != null) {
			return newFolder;
		}
		
		final IPath containerPath = resourceGroup.getContainerFullPath();
		IPath newFolderPath = containerPath.append(resourceGroup.getResource());
		final IFolder newFolderHandle = createFolderHandle(newFolderPath);
		final boolean createVirtualFolder = useVirtualFolder != null && useVirtualFolder.getSelection();
		createLinkTarget();
		IRunnableWithProgress op = new IRunnableWithProgress() {