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l0ng-ai
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`<config>/history` was two different things at once. The window keeps the input bar's command store there as a *file* (`terminal::history`), and the daemon put each pane's `HISTFILE` in a *directory* of the same name. A path is one or the other, and the daemon created its directory the moment `per_pane_history` was switched on, so the daemon won. After that the window's `append` opened a directory, got an error, and — the call site being `if let Ok(mut f) = open(..)` — dropped the command line without a word. Up and Ctrl-R went on offering whatever had been recorded before the setting was turned on and never grew again. Nothing in the UI or the log said why, and the two halves are in different crates, so neither side had any reason to notice the other's name. Per-pane files move to `<config>/pane-history/`, which leaves the old name to the file that should have had it. An install that already tripped over this is carried across on the next start: the directory sitting at the old name is exactly what belongs at the new one, so it is renamed rather than abandoned — but only when it *is* a directory, since a plain file there is the window's store and moving that would take the very thing this repairs, and only when the new name is free, so a second call cannot bury a directory in use. Verified end to end against a daemon: with the setting on it now creates `pane-history/` 0700 with the pane files in it, and an append to `<config>/history` succeeds where it previously failed. Seeding an old-layout install with `history/pane-9` and starting the daemon leaves the line intact at the new path. Guards: one reads the window's source for the names it passes to `config_path` and fails if the daemon's directory is among them, so moving either side onto the other trips it; one covers the three ways the move can lose data (directory moves, file stays, occupied target is not overwritten). Both were checked against injected regressions. The privacy page and the integration test that read the path follow it.