Bug 32384 Cannot open type hierarchy after a cancel
JUnit setup 1) open the type hierarchy on TestCase 2) press F4 on Object 3) cancel in progress bar 4) press F4 on Object again ->nothing happens
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
Runnable runnable= new Runnable() {
					public void run() {
						getCurrentViewer().updateContent(doExpand); 
					}
				};
				BusyIndicator.showWhile(getDisplay(), runnable);
				if (!isChildVisible(fViewerbook, getCurrentViewer().getControl())) {
					setViewerVisibility(true);
				}	
			} else {							
				fEmptyTypesViewer.setText(TypeHierarchyMessages.getFormattedString("TypeHierarchyViewPart.nodecl", fInputElement.getElementName()));				 
				setViewerVisibility(false);
			}
		}
	}
	
	private void updateMethodViewer(final IType input) {
		if (!fIsEnableMemberFilter && fCurrentOrientation != VIEW_ORIENTATION_SINGLE) {
			if (input == fMethodsViewer.getInput()) {
				if (input != null) {
					Runnable runnable= new Runnable() {
						public void run() {
							fMethodsViewer.refresh(); 
						}
					};
					BusyIndicator.showWhile(getDisplay(), runnable);					
				}
			} else {
				if (input != null) {
					fMethodViewerPaneLabel.setText(fPaneLabelProvider.getText(input));