Bug report and patch with fix filed to
https://bugs.freepascal.org/view.php?id=35335
Please review.
--
Regards,
Denis Golovan
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Some more information on the matter.
While investigating the issue I noticed that gtk_gl_area_destroy is called
twice for single OpenGL widget when changing Parent property.
That does not look nice as it accesses freed memory second time it calls
gdk_gl_context_unref (context : PGdkGLContextPriv
