http://mail.gnome.org/archives/gtk-devel-list/2002-February/msg00128.html

Here is a patch which adds stock_xalign plus getter and setter.

Created attachment 18047 [details] [review]
stock alignment

* Big-picture-question; it seems a bit weird to me and
  probably to users that this property applies to 
  stock items in particular, which don't seem on the
  face of it different than labels.

  It would be a bit hacky to implement, but maybe we
  should just have ::xalign ::yalign properties that
  magically hook up correctly if GTK_IS_MISC() or
  GTK_IS_ALIGNMENT() bin->child? 

  (Or maybe they only hook up when GTK+ creates the
  immediate child and not in other cases; that would
  be easier to implement)

* If the above isn't followed, then I think the text
  that appears in multiple places
  
   "horizontal alignment of the stock item" 

  needs improvement. What is the stock item? Stock items
  aren't GUI objects. I'd say "the horizontal alignment
  of the stock image and label" or something like that.
 

* I'd put the #define and the private structure typedef 
  in the C file, not the H file.

* IMO assigning priv variables at top of function
  is cleaner, rather than doing them where they are 
  needed. (Referring in particular to gtk_button_init())

* I think the extra complexity to change the align
  of the alignment on the fly rather than reconstructing
  is worth it. It seems to me bad to have:

   gtk_button_new_from_stock() 
   gtk_button_set_stock_xalign()

  create-destroy-create 3 widgets.

Here is a new patch which does things more in the way you proposed. It
compiles, but I haven't tested it. Does gtk_button_add() look correct ?

Created attachment 18416 [details] [review]
button child alignment

I've tested the patch now, and since it works fine, I went ahead and
committed it.