Bug 36456 Type heirarchy show final class icon only on double click [type hierarchy]
When opening a type heirarchy, the icons for the heirarchy do not show final classes (ie. the little 'F' in the icon). When the icon is double clicked to open the class, the icon changes.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
/**
	 * Returns the <code>IShowInSource</code> for this view.
	 */
	protected IShowInSource getShowInSource() {
		return new IShowInSource() {
			public ShowInContext getShowInContext() {
				return new ShowInContext(
					null,
				getSite().getSelectionProvider().getSelection());
			}
		};
	}
	
	boolean isLinkingEnabled() {
		return fLinkingEnabled;
	}
	
	public void setLinkingEnabled(boolean enabled) {
		fLinkingEnabled= enabled;
		PreferenceConstants.getPreferenceStore().setValue(PreferenceConstants.LINK_TYPEHIERARCHY_TO_EDITOR, enabled);
		if (enabled) {
			IEditorPart editor = getSite().getPage().getActiveEditor();
			if (editor != null) {
				editorActivated(editor);
			}
		}
	}
}