Korean composition in remote-desktop apps no longer breaks mid-
syllable. Those apps report cursor movements of their own accord from
their local dummy buffer, and the keyboard used to read that as "the
user moved the cursor" and reset the syllable being built - so some
syllables came out split or half-formed, depending on timing. That
verdict is now ignored where composition is materialised, and the
everyday syllables are pinned by tests played against a model buffer.
