gtk:text-buffer-apply-tag (buffer tag start end)

buffer -- a gtk:text-buffer object
tag -- a gtk:text-tag object, or a string with the tag name
start -- a gtk:text-iter iterator with the start bound of the range to be tagged
end -- a gtk:text-iter iterator with the end bound of the range to be tagged

Emits the "apply-tag" signal on the text buffer. The default handler for the signal applies tag to the given range. The start and end iterators do not have to be in order. The Lisp implementation combines the two gtk_text_buffer_apply_tag() and gtk_text_buffer_apply_tag_by_name() functions. The second funtion is not exported.