fix(multicursor): unsynced primary-overlapping cursor #42089

Problem:
- The primary-overlapping cursor is synced to primary only after
  cascade, so it may display at a shifted position (e.g. after "rx")
  during cascade.
- LHS-replay edits apply twice if there is a primary-overlapping cursor.

Solution:
- Sync the primary-overlapping cursor _before_ replay. This ensures the
  mark is correct _during_ the cascade.
  - Drop the post-cascade sync; this is safe because the overlapping
    mark and the primary-tracking mark are both right-gravity, so they
    get shifted the same way.
- Set `origin` on LHS-replay atoms, so the cascade can compare it.

Bonus: a buffer-switching mapping no longer LHS-replays if it ends up in
a different buffer.

0 files changed, 0 insertions, 0 deletions