Getting Source View and StyleScheme Widget to work
The Sourceview is an alternative Textview - it is specialised to view and edit source-code. One really should have used Gtk.Textview before using GtkSource.View in code.
The main problem is that Sourceview’s GObject Introspection is not fully working , yet.
Sometimes a bit of hacking and fiddling is needed to reach a goal. For now, after wrestling a bit with the bindings and jumping through some loops, I am quite satisfied with my code.
I have been using Pygments as highlighter, which is working quite well under GTK. Currently working on a Snippet-Manager, cause I am tired that every IDE provides its own. And as usual import and exports across IDE-Snippets is a pain.