Enrico Granata b3f6219ebe Add a very rough mutual exclusion mechanism to prevent a UIView from trying to provide its QuickLook object recursively. The same logic used for NSView is also used here basically verbatim. This is because in playgrounds, you can get a view to log itself as part of its drawRect method due to the way we defined our instrumentation. This very simple mechanism only works because drawing can only happen on the main thread - otherwise, we'd need something smarter than an NSSet of UIView pointers. Fixes rdar://17895769 ...

Swift SVN r21444

2014-08-25 21:11:18 +00:00

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