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bug#23462: 25.0.93; Crash on OS X when suspending main frame

From: Alan Third
Subject: bug#23462: 25.0.93; Crash on OS X when suspending main frame
Date: Wed, 11 May 2016 23:28:24 +0100
User-agent: Mutt/1.5.24 (2015-08-30)

On Tue, May 10, 2016 at 11:57:47PM +0200, Anders Lindgren wrote:
> As far as I can tell, I don't see a better location to place the test. (I
> have to include myself in the group who have no idea why drawRect is being
> called when the frame is miniatured.) I would suggest that we add it as you
> originally suggested.
> Alan, what do you say? Have you looked into this?

Right, on a hunch that it's something to do with Emacs receiving and
processing signals or input of some sort during or immediately after
minimization, I tried wrapping

    [[view window] miniaturize: NSApp];

in x_iconify_frame with block_input and unblock_input:

    [[view window] miniaturize: NSApp];

which seems to have solved the crash.

I'm not super-happy with this as the error message implies that
something is being created in Objective C, then either clobbered or
released elsewhere, *then* Objective C tries to release it
automatically and it's already clobbered/gone. But I can't trace it
back to find out what's actually going on. It appears to be related to
unblock_input forcing the processing of "pending" signals or input
when drawRect runs, but why is that breaking Objective C's garbage
collection routines?

I guess it probably doesn't matter, as long as it works.
Alan Third

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