Bug 5774 Unpredicatable behaviour on double click in packages view
from EC: If you double click a file in the packages view, it opens the file (technically, compilation unit I believe) -- if not already open. However, if the file is already open, a single click selects it as the active editor tag; a double click expands its structure in the packages view. This is unpredictable behavior ;
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
return result + " - " + wsstr;
	}
	
	public String getTitleToolTip() {
		if (fViewer == null)
			return super.getTitleToolTip();
		return getToolTipText(fViewer.getInput());
	}
	
	/**
	 * @see IWorkbenchPart#setFocus()
	 */
	public void setFocus() {
		fViewer.getTree().setFocus();
	}
	/**
	 * Sets the working set to be used for filtering this part
	 */
	public void setWorkingSet(IWorkingSet ws) {
		fWorkingSetFilter.setWorkingSet(ws);
		firePropertyChange(IWorkbenchPart.PROP_TITLE);
		fFilterWorkingSetAction.setChecked(ws != null);
		fRemoveWorkingSetAction.setEnabled(ws != null);
	} 
	
	/**
	 * Returns the shell to use for opening dialogs.
	 * Used in this class, and in the actions.
	 */
	private Shell getShell() {