Closes #33637 Closes #37332 and solves part of https://github.com/zed-industries/zed/discussions/33580#discussioncomment-14195506 This improves the "C" and "alt-C" actions to work like helix. It also adds "," which removes all but the newest cursors. In helix the one that's left would be the primary selection, but I don't think that has an equivalent yet, so this simulates what would be the primary selection if it was never cycled with "(" ")". Release Notes: - Improved multicursor creation and deletion in helix mode --------- Co-authored-by: Jakub Konka <kubkon@jakubkonka.com>