Bugfix
(User-visible)
If buttons do not fit into the button bar and then slip into the ... menu, you cannot see in the menu which buttons are executable and which are not:
In the example here, "Start task" is executable and "Cancel task" is disabled.
Test
If you are on a page with buttons above the footer (e.g. structures) and drag the page so small that all buttons no longer fit next to each other, they are pushed into an "overflow menu". (3-point button)\\ The menu that opens there should now look stylistically the same as other pop-up menus. In addition, the status/condition of the buttons in the menu should be recognizable. (Disabled grayed out and visually different from active options)