gtkrc widget_class widget class 区别
http://mail.gnome.org/archives/gtk-devel-list/2004-July/msg00113.html
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Summary: in gtkrc files,1. "widget" is to reach particular widgets by name, used for funny apps2. "widget_class" is to reach all widgets in a generic subhierarchy,used for themes3. "class" is to reach a particular class of widgets, but not theirchildren.
