GtkPixmapMenuItem is a Gnome
widget despite its name. This widget solves a very
specific problem: namely, if a menu contains check or
radio menu items, GTK+ indents the child widget of all
the menu items in the menu to make room for the check
or radio buttons. Gnome uses pixmaps next to some menu
items; GtkPixmapMenuItem
indents pixmaps in the same way GTK+ indents check or
radio buttons. If you simply added a pixmap and a label
to a GtkMenuItem, the pixmap
would be incorrectly aligned with the plain labels in
other menu items. This widget is not really
pixmap-specific; any widget can be placed in the
unindented "pixmap" slot. Usually GtkPixmapMenuItem is created
implicitly with the Gnome menu creation functions.
