Follow-up Comment #1, bug #25943 (project gnustep):
Your great debugging session shows quite clear where the problem is. It is
the call to [NSGraphicsContext saveGraphicsState], as this happens on a
secondary thread there is no previous graphics context (GSCurrentContext()
return nil). NSApplication takes care that the thread that calls
[NSApplication init] has a graphics context set up, but similar things don't
happen automatically for other threads.
You could use the method [NSGraphicsContext setCurrentContext:] in that
secondary thread to do this yourself.
I would expect that behaviour of Cocoa to be different and will welcome any
patches to make drawing in GNUstep work on secondary threads.
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