fix(cmdatom): capture <Cmd>, not its subatoms #42020

Problem:
A command's `:norm` children are captured as Visual subatoms:
`v<Cmd>normal! e<CR>d` is "decomposed" to `ved`. That is a cosmetic,
nice-to-have feature, which greatly complicates the cmdatom logic:
it must detect "lossy" cases (API moves, "gv" on marks the command
set, a session ended and restarted).

Solution:
Drop the nice-to-have.
- A command is captured as itself, never its `:norm` children.
- While a child frame runs, a pending Visual session is kept open until
  the enclosing frame resolves.
- `:`/`<Cmd>` no longer decline to be a Visual subatom.
- Stuffed keys ("." replay, "x" => "dl") and K_EVENT children (RPC,
  timer), are still captured as their translation.
- `mc_add()` discards any pending Visual session, so `{Visual}Q` does
  not cascade recursively to the cursors it just created.

0 files changed, 0 insertions, 0 deletions