gtk-2.8.17: combo box: width calculated incorrectly?

[Felix Kater <fkater googlemail com>]

Hi,

I am using gtk-2.8.17/win32. I've made a combo box with about 30 entries, most just text, some lines like 
"**********************************" (a string of asterisks).

At runtime when I open the box I've noticed that the combo box adds more extra space to the right of all 
lines than actually needed by the longest line. So to put in simple words: the widget is too wide.

It seems to me as if the combo box does not calculate correctly the maximum line width and so reseves too 
much space (of course even when it is in closed state).

Felix