Operating system: macOS / Mac OS X 10.9 (Mavericks)
Graphics card: AMD Radeon HD 6770M
Broken: 2.80 beta
**Short description of error**
Submenus don't expand when you move the cursor in a certain way.
**Exact steps for others to reproduce the error**
1. Open a menu with submenus.
2. Move the cursor down, go over a submenu but keep moving until just before the next item. => the hovered submenu's tooltip shows, but the submenu itself won't open.
Easy to reproduce in menus where there's a submenu as the first or last item. Simply move the cursor past the submenu, then back on it. => It won't open.