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[pygame] Passing GL_DOUBLEBUFFER in display.set_mode() causes title bar andframe to disappear

When using Pygame 1.5.6 with PyOpenGL-Minimal 2.0.1.04 (GeForce 4
Ti4200/Detonator 45.23/Windows XP SP1), I get the following
behaviour:

Passing GL_DOUBLEBUFFER in display.set_mode() causes the title bar
and frame to disappear.  This is not the behaviour in a C SDL
app.

Also, the DOUBLEBUF flag must be passed if doing OpenGL, otherwise
display flickers badly... and again in a C SDL app, there is no
such requirement.

Note that I'm using pygame.display.flip() to update the frame.


(CC'ed this to the PyOpenGL-users list just in case someone wants to
confirm if this is a problem with the version of PyOpenGL I'm
using.)