Bastien Montagne 5f0933f07a Fix T49829: Removal of custom icon previews during add-on unregister crashes Blender.
Issue was happening when removal of custom icons was done while they
were still being rendered by preview job.

Now add a 'deffered deletion' system, to prevent main thread to delete
preview image until loading thread is done with them.

Note that ideally, calling `ED_preview_kill_jobs()` on custom icon
removal would have been simpler, but we don't have easy access to
context here...
2016-10-27 13:06:14 +02:00
2016-10-25 17:34:01 +02:00
2016-10-26 23:33:41 +11:00
2016-07-15 01:28:00 +10:00
2016-07-15 01:26:26 +10:00
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