gtk_file_selection (gtk+-1.2.10) does not allow subsequent set_wmclass()

[Pawel Salek <pawsa theochem kth se>]

(I sent this mail some time ago but it apparently did not make it to the 
list)

Hello,

It has been observed that the following sequence:

    fsw = gtk_file_selection_new(_("Attach file"));
    gtk_window_set_wmclass(GTK_WINDOW(fsw), "file", "Balsa");

generates a warning:
Gtk-WARNING **: shouldn't set wmclass after window is realized!

with gtk+-1.2.10 (but not with gtk+-1.2.9). Why was this altered? Is this 
a bug or feature? The
workaround would be to unrealize the window by hand but this would be ugly 
and not portable.

Can somebody offer a solution?

/Pawel
--
Pawel Salek, Theoretical Chemistry, SCFAB, Stockholm
http://www.theochem.kth.se/~pawsa/