Returns true if tag is toggled off at exactly this point.
If tag is null, returns true if any tag is toggled off at this point.
Note that if this function returns true, it means that
iter is at the end of the tagged range, but that the character
at iter is outside the tagged range. In other words,
unlike gtk.text_iter.TextIter.startsTag, if this function
returns true, gtk.text_iter.TextIter.hasTag will return
false for the same parameters.
Returns true if tag is toggled off at exactly this point.
If tag is null, returns true if any tag is toggled off at this point.
Note that if this function returns true, it means that iter is at the end of the tagged range, but that the character at iter is outside the tagged range. In other words, unlike gtk.text_iter.TextIter.startsTag, if this function returns true, gtk.text_iter.TextIter.hasTag will return false for the same parameters.