could combox box warn if no cell-renderer is set

[Stefan Kost <kost imn htwk-leipzig de>]

Hi hi,

now I've again forgot to set cell-renderers for a combobox that I have changed
from combo_box_text to a normal one (due to the very restricted possibillities
of the former).
Question, could the combox_box issue a warning (when it gets drawn) and there is
no cell-renderer set. Or does anyone know of a situation where this would make
sense.

Ciao
  Stefan
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