The calls used old bugzilla URLs and nobody cared about that.
So apparently they are very unused.
There's also a potential conflict between gitlab and bugzilla URLs and
what base bug to use there.
The old usages have been converted to comments.
So far, this is just supposed to be gdk_cairo_set_source_pixbuf().
Note that this is usually not an API guarantee but courtesy to
applications that used these APIs without a gtk_init() call.
https://bugzilla.gnome.org/show_bug.cgi?id=708547