This allows to limit the maximum width of a menu. It can be useful for instance in task manager where long file names for recent documents will result in gigantic menus.

The property has a RESET method (which is called if you assign "undefined") which will set it back to QWIDGETSIZE_MAX to remove the size restriction.

Comes with a manual test. The menu itself is still placed as though it occupied the full width. :(

Hugo, any idea what's up with Breeze theme not eliding the menu items? This is with both device pixel ratio 1 (plasmashell) and 2 (in the screenshot). I recall there being some Qt recently having been fixed but I'm not sure, might as well be a Breeze bug, though it also happens with Fusion.