Catalogs need an attribute to depict that widget types are provided by the app.
Submitted by Tristan Van Berkom
Currently if a project uses widgets from any external catalog besides the base gtk+ catalog, the app is considered to "require" the library/module that comes with those widgets.
We could add an "app-provided" attribute to the catalog to
depict that widgets are coded directly into the app instead
of in a support module (this would kill the
for that catalog in a glade file for instance).