This is an intermediate version towards GtkSourceView 4.0. GtkSourceView 4.0
will still depend on GTK+ 3, and will be released in March 2017.
* gtk_source_completion_item_new2() has been renamed to
gtk_source_completion_item_new().
* gtk_source_search_context_forward2() has been renamed to
gtk_source_search_context_forward().
* gtk_source_search_context_forward_finish2() has been renamed to
gtk_source_search_context_forward_finish().
* gtk_source_search_context_backward2() has been renamed to
gtk_source_search_context_backward().
* gtk_source_search_context_backward_finish2() has been renamed to
gtk_source_search_context_backward_finish().
* gtk_source_search_context_replace2() has been renamed to
gtk_source_search_context_replace().
* The GtkSourceSearchContext:settings property is now construct-only.