Editor crashes when calling RepaintImmediately followed by Close on EditorWindow.

See included project for three tests, one of which crashes the editor.

The test GetWindowThenRepaintImmediatelyThenClose should crash the editor on OSX pretty consistently (it runs 30 iterations). If you insert a yield (i.e. GetWindowThenRepaintImmediatelyThenYieldThenClose) between RepaintImmediately and Close it doesn't crash.

The call stack changes from time to time, but it usually has this at the top:

#0 0x00007fff95647803 in tiny_malloc_from_free_list ()
#1 0x00007fff95646705 in szone_malloc_should_clear ()
#2 0x00000001008a2ac4 in my_calloc(_malloc_zone_t*, unsigned long, unsigned long) at /Users/salvadorj/Repositories/unity1/Runtime/Allocator/MemoryManager.cpp:313

I'm not sure what's happening, but maybe the window is being deallocated twice?