The gtk_source_style_get_data() function has been removed. GtkSourceStyle is now a boxed type (a simple struct), no longer a GObject. Another important difference is to call the right ref/unref functions for memory management.

The GtkSourceSearchContext:match-style property is a GtkSourceStyle, so it may require some code changes when using it.

The gtk_source_style_scheme_get_authors() function has been removed.