Bug 27764 IResource.findMarkers is called too often
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerActionGroup.java
private CollapseAllAction fCollapseAllAction;
	private RenameResourceAction fRenameResourceAction;
	private MoveResourceAction fMoveResourceAction;
	
	private NavigateActionGroup fNavigateActionGroup;
	private BuildActionGroup fBuildActionGroup;
	private CCPActionGroup fCCPActionGroup;
	private WorkingSetFilterActionGroup fWorkingSetFilterActionGroup;
	
	private MemberFilterActionGroup fMemberFilterActionGroup;
	private CustomFiltersActionGroup fCustomFiltersActionGroup;	
 	
	public PackageExplorerActionGroup(PackageExplorerPart part) {
		super();
		fPart= part;
		IWorkbenchPartSite site = fPart.getSite();
		Shell shell= site.getShell();
		ISelectionProvider provider= site.getSelectionProvider();
		IStructuredSelection selection= (IStructuredSelection) provider.getSelection();
		setGroups(new ActionGroup[] {
			new NewWizardsActionGroup(site),
			fNavigateActionGroup= new NavigateActionGroup(fPart), 
			new ShowActionGroup(fPart), 
			fCCPActionGroup= new CCPActionGroup(fPart),
			new RefactorActionGroup(fPart),
			new ImportActionGroup(fPart),
			new GenerateActionGroup(fPart), 
			fBuildActionGroup= new BuildActionGroup(fPart),
			new JavaSearchActionGroup(fPart),
			new ProjectActionGroup(fPart),