OpenGL: destroy QGLContext allocated by QGLContext::fromOpenGLContext

QGLContext already uses ownContext to identify when it "owns" QOpenGLContext
and will delete QOpenGLContext when needed.  In the other way
QGLContext::fromOpenGLContext creates a QGLContext for QOpenGLContext, and is
now using qGLContextDeleteFunction to identify if QOpenGLContext "owns"
QGLContext by QGLContext only passing a delete function when QOpenGLContext
should delete QGLContext, and by QOpenGLContext calling deleteQGLContext() from
destory() to do the destruction avoiding the previous leak and sometimes crash
on exit.

Change-Id: I65e791776e99b456e4d0c70fc5b5cdb33c975893
Task-number: QTBUG-40286
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/opengl/qgl_p.h b/src/opengl/qgl_p.h
index 22fc3f4ad0..ac4b6d2acc 100644
--- a/src/opengl/qgl_p.h
+++ b/src/opengl/qgl_p.h
@@ -242,6 +242,7 @@ public:
     void swapRegion(const QRegion &region);
 
     QOpenGLContext *guiGlContext;
+    // true if QGLContext owns the QOpenGLContext (for who deletes who)
     bool ownContext;
 
     void setupSharing();