#102 TTT crashes on resize

[Jason Dorje Short]

If you try to resize the GTK TTT client, it will crash.

[Josef Spillner]

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This error message is received upon resizing a window:

Gdk-ERROR **: BadDrawable (invalid Pixmap or Window
parameter)
serial 479 error_code 9 request_code 62 minor_code 0

Most of the other Gtk+ games are not resizeable at all, how
can this be enforced?