(gucharmap:30880):
Gtk-CRITICAL **: 17:41:07.804: gtk_entry_set_text: assertion
'text != NULL' failed
This happens
e.g. when I'm using the up down arrows within the text entry.
Btw, this happens also if I only replace (without setting up
all the connections), gtk_combo_box_new() with
gtk_combo_box_new_with_entry(). I'm still trying to figure out
what went wrong.