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
#GtkTextBuffer::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 #GtkTextBuffer::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.