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Esc ran Toggleterm, which hopped between the newest DOC and the newest
TERMINAL. That distinction never earned its keep. It made Esc unpredictable —
which of three panes you landed on depended on their kinds, not on where you
had been — and it could not alternate between two files at all, which is the
case you hit most. Editing two files, Esc did nothing.
The replacement already existed. Last (SPC j j) is "the pane you were in
before this one, whichever it was": it walks the jump stack for the newest
entry naming a different pane and restores its line and column. So Esc, and
Shift-Esc in tty, now run Last, and Toggleterm is deleted rather than renamed
— a third implementation of "go to the other pane" was the thing to avoid.
SPC w t goes with it; the w group is the four directional moves, and the jump
group already had SPC j j.
Held down, Esc alternates. Two files, a file and its shell, a file and a
+Search — all the same, because Last has no notion of kind to get wrong.
This depends on the swap in the same series: Last reads the stack backwards,
and until hopping stopped appending, the pane you came from could fall off it.
windownav.snap needed only its keys and prose changed — its golden did not
move at all, which is the useful evidence here: for the one scenario the old
builtin handled well, Last produces an identical focus sequence.
Coverage for what it did not handle is new: a unit test opens a second FILE by
looking its name and asserts Esc alternates between two panes of the SAME
kind, which is the case that used to be a no-op.
Docs follow: tutor.txt, docs/helix-keys.md, docs/design.typ, and the builtin
index goldens, which are now one row shorter.
75/75 snapshots, both unit suites, and the macOS ABI build all pass.
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Their only special feature is now the keys they are assigned. `Look main.zig`
typed in a tag is the same look a right click is; config.look_cmd/exec_cmd
point the two buttons and Enter/Tab at them, so retargeting Enter to Grep is
one line. actOnSelection — a hand-written cascade with the builtin dispatch
nested inside it — is gone, and the `button` parameter it threaded through five
KEYBOARD call sites went with it.
New syntax, spelled once in config.zig: @`ls -la` names a command to run
rather than a file to open. Word expansion takes the quoted run whole, the way
acme does for its own </|/> words, so a click inside one does not hand Look the
fragment `ls`.
And it nests: @`Look .` unwraps, re-enters the dispatcher, and looks at the
directory. Guarded at depth 8, which is unreachable today (every re-entry
strips a word or a delimiter pair, so the string strictly shrinks) and exists
for a future syntax that does not shrink.
leader_path is now optional: a builtin may have no SPC path when its shortcut
is a key and a mouse button. New golden cmdword; the other 59 unmoved.
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