[GtkGLExt] widget in modal dialog

[Tobias Eberle <tobias eberle gmx de>]

Hello,

in my application I have a mainwindow without opengl usage and a modal
dialog using an opengl widget. Starting the program and opening the
dialog works well, but if I close the dialog and open it again (it is a
new instance) or closing the whole program and start it again, I get the
following error message:

The program 'vvis' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadColor (invalid Colormap parameter)'.
  (Details: serial 13445 error_code 12 request_code 1 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error()
function.)

I get this message if I start then other gtkglext apps, too.
I have to restart X to get rid of this message.

If I put the widget on the mainwindow too, everything works fine.

I figured out that the problem is related to Gdk::GL::Config::create().
I call this in the constructor of my widget. If I do this in the
mainwindow instead it works again :)

Can anyone tell my why this problem happens?

Bye, Tobias