Bug 71283 Type Hierarchy View should show active working set in content description [type hierarchy]
Eclipse 3.0 The type hierarchy should show the active working set in the content description. Instead of WorkbenchPart#setTitle(), it should use setContentDescription() to display the focus type and active working set.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
private boolean isChildVisible(Composite pb, Control child) {
		Control[] children= pb.getChildren();
		for (int i= 0; i < children.length; i++) {
			if (children[i] == child && children[i].isVisible())
				return true;
		}
		return false;
	}
	
	private void updateTitle() {
		String viewerTitle= getCurrentViewer().getTitle();
		
		String tooltip;
		String title;
		if (fInputElement != null) {
			String[] args= new String[] { viewerTitle, JavaElementLabels.getElementLabel(fInputElement, JavaElementLabels.ALL_DEFAULT) };
			title= TypeHierarchyMessages.getFormattedString("TypeHierarchyViewPart.title", args); 
			tooltip= TypeHierarchyMessages.getFormattedString("TypeHierarchyViewPart.tooltip", args); 
		} else {
			title= viewerTitle;
			tooltip= viewerTitle;
		}
		setTitle(title);
		setTitleToolTip(tooltip);
	}
	
	private void updateToolbarButtons() {
		boolean isType= fInputElement instanceof IType;
		for (int i= 0; i < fViewActions.length; i++) {