I was getting a crash on quit resulting from a drawRect: method being
called on a window that had been ordered out. I can solve the immediate
problem just by bailing out of drawRect: if the window is invisible, but
I wish I understood what's going on. The call stack shows a run loop
observer calling CA::Transaction::commit() resulting in -[NSWindow
displayIfNeeded] being called, but I don't know why displayIfNeeded
would do anything with an invisible window.
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