Comment 1 for bug 1600177

Question: does the action, which is not in the overflow, get triggered by the shortcut assigned to it? I suspect it does.

The thing is, once the action goes into the overflow, it will be deactivated as long as the overflow is shown. This is due to ActionSelectionPopover being used by the overflow, which has its own ActionContext (PopupContext), which is inactive as long as it is not getting visible.