Code review comment for lp:~uriboni/unity-2d/launcher-shelf

Please note that is one issue that I have not been able to solve.

In some cases (which i can't repro consistently) the menu for some items stop to appear on mouse over.
The items are always those close to the bottom of the normal list or the item in the shelf (i.e. trash).

The way I seem to get this issue the most often is when i very quickly move the mouse up and down over the seam between the launcher and shelf, making sure to go in and out of the bottom autoscroll area of the main list in both directions.
Then going over these items will consistently stop showing a menu.

The menu doesn't show because of the check for isVisible() in LauncherContextualMenu::show() finds that the menu isVisible() is true even though there's no menu actually visible on screen.