Editor: port to GtkSourceCompletion
As part of the GTK 4 port of GtkSourceView, it got a new completion engine very close to Builder's completion engine (as I hoisted it up there). We should drop ours as part of our GTK 4 port and use it instead.
As part of the GTK 4 port of GtkSourceView, it got a new completion engine very close to Builder's completion engine (as I hoisted it up there). We should drop ours as part of our GTK 4 port and use it instead.