So, it turns out that in #macOS 14 #Sonoma, if you have a NSPopUpButton, and use removeFromSuperview and then later addSubview to add that item again to a view, macOS doesn't draw the button properly, until it gets clicked at least once.
(setting up said Popup is very expensive, as in "slow", in the app in question, so for 15 years, it was a working idea to keep it around)
Awesome.
Yet another #bug in the long long list of massive problems in the #AppKit system frameworks in #macOS14.
