[Cogl] [PATCH] replace public cogl_flush with cogl_framebuffer_flush

[Neil Roberts]

I wonder if cogl_framebuffer_flush should have a more scary name like
cogl_framebuffer_flush_cogl_state or something if it really is only
meant to be used when you are doing dodgy things with GL yourself.

We currently have a problem that if you create a single-buffered
onscreen framebuffer then there isn't a legitimate way to get the
rendering to appear on the screen. We might want to use the name
cogl_framebuffer_flush or cogl_onscreen_flush to make that happen. That
would flush the journal and also call glFlush(). If that's a possibility
then we should keep the name free.

Regards,
- Neil
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