Hi again, I'm going to answer my own question. I've come to realize that QPlatformMenuBar::syncMenu() and QPlatformMenu::syncMenuItem() are indeed intended for applying changes atomically. They are called after the properties of menus or items are modified but not during their construction. My oversight was that I had only tested menus and items with their values set directly in their constructors, which is why I never saw those virtual methods being invoked. I apologize for any confusion.
I'm still interested in finding documentation related to platform theme menus, so any help with that would be greatly appreciated :) Cheers!
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