Created attachment 204699 [details] [review]
Sets label_actor for a PopupMenuItem

STEPS TO REPRODUCE

1. Activate Screen Reader (trough Universal Settings)
2. Navigate on the panel (Ctrl+Alt+Tab)
  2.1 Forget that each panel icon just says "Panel" (a different bug)
3. Go to the Accessibility Icon
4. Open menu and navigate inside

EXPECTED OUTCOME

You hear "High Contrast - Panel", "Zoom-Panel", "Universal Access Settings-Panel" etc

ACTUAL OUTCOME

You hear "High Contrast" etc but not "Universal Settings". This also happens with "Sound Settings" on the sound menu, "Bluetooth Settings" with the "Bluetooth menu" etc

NOTES

Looking at the code, those working are PopupMenu.PopupSwitchMenuItem and the not working are PopupMenu.PopupMenuItem. Patch attached just sets the proper label_actor for a PopupMenuItem (after all label_actor was initially added for accessibility purpose, see bug 644253).