Inserts the text in markup at position iter. markup will be inserted
in its entirety and must be nul-terminated and valid UTF-8. Emits the
insert-text signal, possibly multiple times; insertion
actually occurs in the default handler for the signal. iter will point
to the end of the inserted text on return.
Inserts the text in markup at position iter. markup will be inserted in its entirety and must be nul-terminated and valid UTF-8. Emits the insert-text signal, possibly multiple times; insertion actually occurs in the default handler for the signal. iter will point to the end of the inserted text on return.