This is equivalent to (gtk_text_iter_begins_tag() || gtk_text_iter_ends_tag()), i.e. it tells you whether a range with tag applied to it begins or ends at iter.
a GtkTextTag, or NULL. [allow-none]
whether tag is toggled on or off at iter
See Implementation
This is equivalent to (gtk_text_iter_begins_tag() || gtk_text_iter_ends_tag()), i.e. it tells you whether a range with tag applied to it begins or ends at iter.