Bug 261031 [CommonNavigator] IPipelinedContentProvider getParent() returning the suggested parent is not ignored
"Link with Editor" neglects to expand the tree in Project Explorer for not C/C++ file types after reopening eclipse. My case: 1. Create a new subfolder in C/C++ project. Place there a new file with non-C/C++ extension like hello.txt. Open the file with text editor. 2. Quit and reenter eclipse. It should open hello.txt in editor at that point. 3. In Project Explorer, push button "Link with Editor". I expect the tree to be expanded and the cursor placed on hello.txt at that point. As a side note, the button is actually named "Link open editors with content in the Navigator" (???). Well, that appears to be absolutely true and if you open Navigator it is linked. But what about linking in Project Explorer?
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentServiceContentProvider.java
*/
	public NavigatorContentServiceContentProvider(NavigatorContentService aContentService) {
		super();
		contentService = aContentService;
		INavigatorViewerDescriptor vDesc = contentService.getViewerDescriptor();
		enforceHasChildren = vDesc.getBooleanConfigProperty(NavigatorViewerDescriptor.PROP_ENFORCE_HAS_CHILDREN);
	}
	public void inputChanged(Viewer aViewer, Object anOldInput, Object aNewInput) {
		viewer = aViewer;
		contentService.updateService(aViewer, anOldInput, aNewInput);
	}
	public Object[] getElements(Object anInputElement) {
		Set rootContentExtensions = contentService.findRootContentExtensions(anInputElement);
		return internalGetChildren(anInputElement, anInputElement, rootContentExtensions, ELEMENTS);
	}
	public Object[] getChildren(Object aParentElement) {
		Set enabledExtensions = contentService.findContentExtensionsByTriggerPoint(aParentElement);
		return internalGetChildren(aParentElement, aParentElement, enabledExtensions, !ELEMENTS);
	}
	public Object[] getChildren(TreePath parentPath) {
		Object aParentElement = internalAsElement(parentPath);
		Set enabledExtensions = contentService.findContentExtensionsByTriggerPoint(aParentElement);
		return internalGetChildren(aParentElement, parentPath, enabledExtensions, !ELEMENTS);
	}
	
	private static final boolean ELEMENTS = true;
	private Object[] internalGetChildren(Object aParentElement, Object aParentElementOrPath, Set enabledExtensions, boolean elements) {
		if (enabledExtensions.size() == 0) {
			return NO_CHILDREN;
		}