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bc16be3cd9
Problem:
An operator completed by a Lua `:omap` textobject emits
`CmdAtom.type="mapping"` (lhs-only, no keys) instead of `type="operator"`.
Analysis:
`atom_redo_set()` declined K_LUA, though the prepped redo
("op" + K_LUA + id + CR) is exactly what "." replays. A no-edit "g@"
emits nothing at all.
Solution:
- `atom_redo_set`: don't decline K_LUA; the redo route now captures the
operator atom.
- `atom_capture_cmd`: don't early-return if the frame has prepped redo.
- op_function(): save/restore redobuff when invoking 'operatorfunc',
like `call_user_func()` does for Vimscript. (Else the Lua callback
may clobber the prepped "g@" redo / dot-repeat.)
fix #41482
TODO:
- async Lua (timer/vim.schedule) can still clobber the pending dot-repeat...