Bug 118163 [Dialogs] - PopupDialog should define constants for zero margins
PopupDialogs traditionally use a 0 margin width and height for the grid layouts used. This should be made an API constant rather than subclasses just knowing.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/PopupDialog.java
MoveAction() {
			super(JFaceResources.getString("PopupDialog.move"), 
					IAction.AS_PUSH_BUTTON);
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.jface.action.IAction#run()
		 */
		public void run() {
			performTrackerAction(SWT.NONE);
		}
	}
	/**
	 * Resize action for the dialog.
	 */
	private class ResizeAction extends Action {