gtk-text-iter-backward-sentence-start (iter)

iter -- a gtk-text-iter instance

True if the iterator moved and is not the end iterator.

Moves backward to the previous sentence start. If the iterator is already at the start of a sentence, moves backward to the next one.

Sentence boundaries are determined by Pango and should be correct for nearly any language. If not, the correct fix would be to the Pango text boundary algorithms.