character to be delivered is a composed character, the iteration
calls composition_reseat_it and next_element_from_composition. If
they succeed to compose the character with one or more of the
- following characters, the whole sequence of characters that where
+ following characters, the whole sequence of characters that were
composed is recorded in the `struct composition_it' object that is
part of the buffer iterator. The composed sequence could produce
one or more font glyphs (called "grapheme clusters") on the screen.