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
updateHierarchyViewer(false);
			if (fInputElement != null) {
				ISelection currSelection= getCurrentViewer().getSelection();
				if (currSelection == null || currSelection.isEmpty()) {
					internalSelectType(getSelectableType(fInputElement), false);
					currSelection= getCurrentViewer().getSelection();
				}
				if (!fIsEnableMemberFilter) {
					typeSelectionChanged(currSelection);
				}
			}		
			updateTitle();
					
			fDialogSettings.put(DIALOGSTORE_HIERARCHYVIEW, viewerIndex);
			getCurrentViewer().getTree().setFocus();
		}
		for (int i= 0; i < fViewActions.length; i++) {
			ToggleViewAction action= fViewActions[i];
			action.setChecked(fCurrentViewerIndex == action.getViewerIndex());
		}
	}
	/**
	 * Gets the curret active view index.
	 */		
	public int getViewIndex() {
		return fCurrentViewerIndex;
	}
	
	private TypeHierarchyViewer getCurrentViewer() {