fix(multicursor): "gv" + Insert-entering cmd #42110

Problem:
- Multicursor does not cascade a `gv`-entered insert-session (`gvc`).
- CmdAtom of a `gv`-entered insert-session (e.g. `gvcX<Esc>`) has
  `keys="1vcX<Esc>"` (redo's fallback), not the typed keys. And is not
  emitted at all if multicursor is inactive.

Analysis:
Redo can't contain "gv", so it does the "1v" fallback, and the
insert-cascade replays redo.

Solution:
Replay "gv" + op at each cursor: store the typed selection in
`InsSession.vsel`; it supplants redo's "1v" in the emitted atom and in
the insert-cascade replay. A cursor without a Visual area skips
a "gv"-based replay (else its keys would run as Normal-mode: "gvrx" =>
"rx").

Redo behavior is unchanged ("1v" fallback): "gv" is absolute, "." acts
at the cursor.

0 files changed, 0 insertions, 0 deletions