Add PurpleRequestField.is_filled vfunc, and a filled property
Review Request #2345 — Created March 13, 2023 and submitted
And then move the string-specific check into the subclass.
Note that this just does a
g_object_notify(G_OBJECT(field), "filled");
instead of adding a convenience function; not sure if I should do that.
Compiled and ran
ninja test
.