Vfunc called when the CSS used by widget was changed. Widgets
should then discard their caches that depend on CSS and queue resizes or
redraws accordingly. The default implementation will take care of this for
all the default CSS properties, so implementations must chain up.
Vfunc called when the CSS used by widget was changed. Widgets should then discard their caches that depend on CSS and queue resizes or redraws accordingly. The default implementation will take care of this for all the default CSS properties, so implementations must chain up.