Cached Pixmap Crash Fix #75
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Ok, so I learned a hard lesson today. For a few months I have been confusing temporaries with locals. It is never ok to return a reference to a local variable! Constant qualification only extends the lifetime of temporary objects, not local variables. Simple solution here was to just make the invalid pixmap returned by cached pixmap a static local. This seems to fix crashes for me in the room editor when there are objects with no sprite.