[GtkGLExt] borderless windows

[Wesley Smith <wesley hoke gmail com>]

Hi,
First, thanks for this really nice implementation.  I had attempted
something like this myself but quickly realized it was a massive job.

I'm trying to create borderless OpenGL windows, which is nearly
possible just by setting gtk_window_set_decorated.  That function gets
rid of the "beveled" border, but there's still a very thin border that
looks like the GtkWindow widget's background color around the OpenGL
drawable.  I'm creating a GtkDrawingArea and adding it directly to the
GtkWindow, so I'd expect it to take up the entire window.  Is this
expected behavior?  Is there a way to get rid of the slight border
even with set_decorated = FALSE?

thanks,
wes