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bb82f9612c
Problem:
The "!" operator stuffs its cmdline continuation (`:.,.+1!`), so its
frame ends before capture (stuff pending) and the redo-prep disappears
with it.
!ipsort<CR> => { type='excmd', lhs=':.,.+1!sort<NL>', keys=':.,.+1!sort<NL>' }
Compare to builtin "." which works bc `do_bang()` completes the redo
(`!ip` + `sort<NL>`).
Solution:
Appoint the stuffed continuation frame as the "redo-prep" frame.
!ipsort<CR> => { type='operator', operator='!', lhs='!ipsort<NL>', keys='!ipsort<NL>' }
Notes:
- atom_cmd_end(): a frame ending with stuff pending re-points its
redo-prep to the next frame.
- atom_cmd_start(): a stuffed continuation frame (`KeyStuffed`) keeps
the redo-prep; flushed stuff discards it.
