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Live-testing surfaced four edge-case failures in the F9 toggle geometry preservation. Each gets a dedicated regression test.
- Multi-window squeeze: a captured fraction-of-frame replayed at the wrong size in 3+ window layouts because `display-buffer-in-direction` interprets float widths as fractions of the new window's parent, not the frame. In a flat 3-window layout the parent is the root, but in nested splits it's a sub-tree, and the captured fraction blew the layout up. I switched to absolute integer body-cols and body-lines as the captured unit. The unit is layout-independent.
- One-col peek: a claude window captured rightmost (no right divider, body=total) replayed into a middle position (with divider, body=total-1) showed 1 col of the sibling buffer peeking through where claude should have ended. I wrap the integer size in a `(body-columns . N)` / `(body-lines . N)` cons so `display-buffer-in-direction` sets the body explicitly, divider-independent.
- Position swap and compounding gap: `direction=right` in `display-buffer-in-direction` splits the selected window, not the frame edge. In multi-window layouts the new claude landed mid-frame instead of where it came from. Each toggle compounded a 1-col loss because the new position picked up a divider the original lacked. I map the cardinal direction to its frame-edge variant (`right` -> `rightmost`, `below` -> `bottom`, etc.) so claude always returns to the captured edge.
- Extra window after buffer-move: buffer-move (C-M-arrows) doesn't update the claude window's `quit-restore` parameter, so `quit-window` falls through to bury rather than delete. The window stays alive showing some other buffer. Toggle-on doesn't recognize it and creates a fresh side window, landing at N+1 windows. I switched to `delete-window` with a `one-window-p` guard for the single-window-frame case.
One tradeoff: in a layout where claude was deliberately in a middle position (e.g. agenda | claude | todo), the next toggle pulls it to the frame edge rather than the middle. The side-panel pattern is the design intent and the common case.
7 new regression tests covering each scenario. 80 ai-vterm tests pass. Full make test green.
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F9 was a single command that always opened the project picker. Three small frustrations stacked up. With one claude buffer open and not visible, F9 was a redundant prompt to pick a project that already had a session. With claude visible, there was no way to bury it without M-x quit-window. With two projects' buffers alive, swapping between them was a buffer-switch chore.
F9 is now a dispatch:
- Claude visible in this frame: quit the window (toggle off) and capture the geometry first.
- Exactly one claude buffer alive but hidden: re-display it (DWIM single-buffer case).
- Zero or two-plus alive: fall through to the project picker.
C-F9 is the always-pick-project entry point for explicit project switches. M-F9 is a buffer picker over the alive claude buffers. If a claude window is currently shown, the picked buffer replaces it in that window so the split orientation and size carry over. The shown buffer sorts last in the picker with a [shown] marker so RET picks "the other one."
Split geometry persists across toggles. Two module-level vars (cj/--ai-vterm-last-direction, cj/--ai-vterm-last-size) capture at toggle-off and feed a custom display action. After M-S-t flips claude from right to bottom, F9 toggle-off-then-on returns it at the bottom. After a mouse resize, the next toggle restores that fraction. State is per-session. Restarts reset to default right/0.5.
Two display-buffer fixes came out of testing:
- save-window-excursion around (vterm name) keeps the dashboard from being buried on a fresh F9 at startup. vterm calls pop-to-buffer-same-window internally, which would otherwise replace the selected window's buffer before the alist could route the new one.
- The action chain swaps display-buffer-use-some-window for a more specific cj/--ai-vterm-reuse-existing-claude. The generic version stole non-claude windows on C-F9 when the user was focused inside claude (claude on bottom, code on top -> new project landed in the code window). The specific version only reuses windows that already show a claude buffer.
I reclaimed C-F9 from the gptel toggle in ai-config.el. C-; a t still binds gptel.
I added eight new test files (claude-buffers, displayed-claude-window, dispatch, pick-buffer-candidates, window-geometry, capture-state, display-saved, reuse-existing-claude) plus a regression test on cj/--ai-vterm-show-or-create for the dashboard-preservation fix. All 73 ai-vterm tests pass and the full make test suite is green.
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