1dcb3a0f88
The name gtk_text_*_begins_* was used only for begins_tag(). All other similar functions use "starts": starts_line(), starts_word(), etc. So for consistency, add gtk_text_iter_starts_tag() and deprecate gtk_text_iter_begins_tag(). Also change (allow-none) to (nullable), to use the new annotation. https://bugzilla.gnome.org/show_bug.cgi?id=759092