len bytes of text at position iter. If len is -1,
text must be and will be inserted in its
entirety. Emits the "insert-text" signal; insertion actually occurs
in the default handler for the signal. iter is invalidated when
insertion occurs (because the buffer contents change), but the
default signal handler revalidates it to point to the end of the
inserted text.gtkTextBufferInsert(object, iter, text, len = -1)objectitertextlen