Bug 28575 Hierarchy view updates items twice [type hierarchy]
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
}
			} else {
				methodSelectionChanged(fMethodsViewer.getSelection());
			}
		}
		fEnableMemberFilterAction.setChecked(on);
	}
	
	/**
	 * called from ShowQualifiedTypeNamesAction. Must be called after creation
	 * of the viewpart.
	 */	
	public void showQualifiedTypeNames(boolean on) {
		if (fAllViewers == null) {
			return;
		}
		for (int i= 0; i < fAllViewers.length; i++) {
			fAllViewers[i].setQualifiedTypeName(on);
		}
	}
	
	private boolean isShowQualifiedTypeNames() {
		return fShowQualifiedTypeNamesAction.isChecked();
	}
	
	/**
	 * Called from ITypeHierarchyLifeCycleListener.
	 * Can be called from any thread
	 */
	protected void doTypeHierarchyChanged(final TypeHierarchyLifeCycle typeHierarchy, final IType[] changedTypes) {