+ /*
+ We only want to process a grob once.
+ */
+ if (!size)
+ return;
+
+ if (gi.context () != context ())
+ return;
+
+ Real font_size = size
+ + robust_scm2double (gi.grob ()->get_property ("font-size"), 0);
+ gi.grob ()->set_property ("font-size", scm_from_double (font_size));