gtk:text-buffer-add-mark (buffer mark pos)

buffer -- a gtk:text-buffer object
mark -- a gtk:text-mark object with the mark to add
pos -- a gtk:text-iter iterator with the location to place the mark

Adds the mark at the given position. The mark must not be added to another text buffer, and if its name is not nil then there must not be another mark in the text buffer with the same name.

Emits the "mark-set" signal as notification of the initial placement of the mark.