void gtk_text_buffer_add_mark ( GtkTextBuffer* buffer, GtkTextMark* mark, const GtkTextIter* where )
Adds the mark at position
where. The mark must not be added to
another buffer, and if its name is not
NULL then there must not
be another mark in the buffer with the same name.
GtkTextBuffer::mark-set signal as notification of the mark’s
Available since: 2.12