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Kai Uwe Broulik 3c59065d5c qglxconvenience: Avoid null pointer dereference
glXGetVisualFromFBConfig according to documentation can return NULL [1].
This may result in a crash when running Qt applications using ARGB windows
with XLIB_SKIP_ARGB_VISUALS defined.

Also guard QXlibScopedPointerDeleter against illegally calling XFree(nullptr).

[1] https://www.khronos.org/registry/OpenGL-Refpages/gl2.1/xhtml/glXGetVisualFromFBConfig.xml

Task-number: QTBUG-58910
Change-Id: Ie076a1e906ed632543bdab03ef365f699533a61a
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
2017-09-27 08:35:28 +00:00
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