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Levi Neuwirth ffe5ae2d8d
fix(git): reserve the refresh generation at the command, not on arrival 
PR #227 review, P1. Two `git.status` invocations against different
repositories were ordered by which `rev-parse` returned first, not by
which the user asked for last.

`git.status` started an UNVERSIONED `rev-parse`, and the generation was
minted later, inside `start_status`, which runs from that lookup's
completion callback. So invoke status in repo A, then repo B: if B's
root resolved first and A's resolved second, A claimed the NEWER
generation and replaced B. The counter that exists to make the newest
INVOCATION win instead made the slowest SUBPROCESS win --- and it did it
silently, since both requests looked well-formed.

The fix is the ordering, not a new check:

* `reserve_generation()` is called at the point the user ASKS ---
  `git.status` after its early returns and before the spawn, `g` at the
  keypress. An invocation that starts no work reserves nothing, so it
  cannot invalidate one already in flight.
* `start_status` takes the reserved generation as a PARAMETER instead of
  minting its own, so the value survives the round trip through the root
  lookup.
* The root-lookup completion is now `pmacs.git._deliver_root`, and it
  drops a superseded result before any effect: no status spawn, no
  `state.root` write, and no status-line message. A message from an
  invocation the user has already replaced is as wrong as a panel from
  one, and the previous shape would have written both.

Exposed for the same reason `_deliver_status` is exposed: the contract
is about completions arriving in an order the caller did not choose, and
no arrangement of real subprocess timing can guarantee two `rev-parse`
runs finish in a chosen order.

Witness: `g6_21_a_superseded_root_lookup_does_not_spawn_its_status`
drives two real invocations, then completes their ROOT LOOKUPS out of
order --- newer first, older second --- and asserts the superseded one
spawns nothing at all, comparing the status-spawn count before and
after. `g6_17` cannot see this: it drives the STATUS completions out of
order, by which point the generation each carries is already fixed.

Bite: restoring the old ordering (mint on arrival, no staleness check)
fails `g6_21` and nothing else. A test that merely hoped for the bad
subprocess order would have passed on the broken code about half the
time, which is why this one drives the completion directly.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016bqGA6s9tTUFzYpbeW3tai
 		2026-08-09 15:52:17 +02:00
..
common test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
fixtures V0.2-prerequisite pull-forward + M10.11 clean audit round 2026-05-18 10:31:31 -04:00
support docs: record the pipe-masking gate trap in the handoff 2026-07-29 12:25:29 -04:00
acceptance.rs Collapse if-let nests into let-chains (MSRV-1.95 collapsible_if sweep) 2026-05-18 14:29:36 -04:00
ambient_isolation_acceptance.rs fix(isolation): the isolation suite must not itself be ambient 2026-07-31 19:46:18 -04:00
auto_indent_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
auto_indent_crdt_acceptance.rs fix(lint): make the crdt targets pass clippy for the first time 2026-08-01 09:38:36 -04:00
auto_pair_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
auto_pair_crdt_acceptance.rs feat(edit): auto-pairing (Arc 2) 2026-07-11 17:11:56 +01:00
autosave_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
bottom_panel_stage1_acceptance.rs test(panel): pin that the OMITTED default degrades on a pre-panel frontend 2026-08-03 11:16:08 -04:00
bottom_panel_stage2a_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
bottom_panel_stage2b_daemon_acceptance.rs fix(tests): eight version assertions the v22 bump broke, five of them defects 2026-08-07 20:15:33 +02:00
bottom_panel_stage2b_gpu_acceptance.rs fix(tests): eight version assertions the v22 bump broke, five of them defects 2026-08-07 20:15:33 +02:00
bottom_panel_stage2b_protocol_acceptance.rs fix(tests): eight version assertions the v22 bump broke, five of them defects 2026-08-07 20:15:33 +02:00
comment_toggle_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
compile_mode_acceptance.rs feat(view): horizontal scroll, text and decorations together 2026-08-07 22:43:17 +02:00
compile_mode_crdt_acceptance.rs review round 1: the crdt suite Stage 3 missed, and two stale explanations 2026-08-04 12:08:28 +02:00
completion_popup_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
config_registry_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
cua_region_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
desktop_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
dired_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
discovery_acceptance.rs fix(help): forwarders must work programmatically, not only from M-x 2026-07-31 20:31:00 -04:00
editops_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
find_file_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
folding_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
folding_stage2_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
full_grid_resync_acceptance.rs fix(frontend): honor full_grid — the flag existed and nothing read it 2026-08-06 15:05:59 +02:00
gate_script_acceptance.rs build: scripts/gate — a target dir per worktree, and one gate suite (#225) 2026-08-09 09:43:33 +00:00
git_status_stage1_acceptance.rs fix(git): reserve the refresh generation at the command, not on arrival 2026-08-09 15:52:17 +02:00
gpu_font_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
gpu_initial_target_acceptance.rs Implement session-scoped GPU initial targets 2026-07-23 19:03:25 -04:00
gpu_invocation_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
gui_zoom_acceptance.rs docs(zoom): the ties both round up, they do not oppose 2026-08-06 17:50:03 +02:00
horizontal_scroll_acceptance.rs docs(test): five adopters, four of them decorator families 2026-08-07 22:49:59 +02:00
injection_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
journey_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
kill_ring_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
lean4_server_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
lean4_stage1_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
lean_input_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
line_wrap_acceptance.rs fix(editor): the renderer never got the mode everything else was reading 2026-08-07 18:48:11 +02:00
listview_acceptance.rs feat(view): horizontal scroll, text and decorations together 2026-08-07 22:43:17 +02:00
long_line_readable_acceptance.rs feat(view): horizontal scroll, text and decorations together 2026-08-07 22:43:17 +02:00
lsp_dispatch_seams_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
lsp_multi_root_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
lsp_spawn_guidance_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m3_acceptance.rs Initial commit: v0.1.0 2026-05-03 19:51:06 -04:00
m4_acceptance.rs fix(tests): bound the LSP fixture's project detection — retires R8 (#226) 2026-08-09 08:54:06 +00:00
m5_5_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m5_6_acceptance.rs Initial commit: v0.1.0 2026-05-03 19:51:06 -04:00
m5_7_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m5_8_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m5_perf_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m6_4_repl_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m6_5_repl_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m6_7_scrollback_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m6_8_multi_repl_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m6_perf_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m7_3_acceptance.rs Fix CI and Documentation issues 2026-05-04 10:19:19 -04:00
m7_5_acceptance.rs fix(packages): basename-collision reject, SHA-256 cache key, timeout thread join, commit→revision, dead-code (F-005/F-009–F-012) 2026-07-03 18:47:23 -04:00
m7_6_acceptance.rs fix(packages): basename-collision reject, SHA-256 cache key, timeout thread join, commit→revision, dead-code (F-005/F-009–F-012) 2026-07-03 18:47:23 -04:00
m7_7_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_8_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_9_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m7_10_acceptance.rs fix(packages): basename-collision reject, SHA-256 cache key, timeout thread join, commit→revision, dead-code (F-005/F-009–F-012) 2026-07-03 18:47:23 -04:00
m7_11_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m7_review_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_1_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m8_1c_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_1d_acceptance.rs M7 tail: package system, audit lint, lockfile, resolver 2026-05-07 16:50:37 -04:00
m8_2_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m8_3_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m8_5_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m8_6_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m8_7_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m8_9_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m8_10_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m9_1_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m9_2_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m9_3_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m9_4_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m9_5_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m9_6_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m9_7_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m9_8_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
m10_2_perf.rs M10.10 ship gate 2026-05-13 16:28:46 -04:00
m10_10_perf.rs M10.10 ship gate 2026-05-13 16:28:46 -04:00
m10_10_postcard_unknown_variant.rs M10.10 ship gate 2026-05-13 16:28:46 -04:00
m10_11_acceptance.rs M11.1: semantic-frontend protocol scaffolding (wire + capability) 2026-05-18 19:39:07 -04:00
m10_11_perf.rs M10.11: adversarial two-laptop acceptance + jitter; the M10 arc verified 2026-05-15 20:51:00 -04:00
m11_5_semantic_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
mode_system_wiring_acceptance.rs Keep the v21 panel wire dark for v20 clients 2026-07-28 14:08:17 -04:00
overlay_reattach_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
persistence_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
query_replace_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
resource_reconciliation_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
save_clobber_guard_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
statusline_segments_acceptance.rs fix(tests): eight version assertions the v22 bump broke, five of them defects 2026-08-07 20:15:33 +02:00
tab_width_acceptance.rs feat(view): horizontal scroll, text and decorations together 2026-08-07 22:43:17 +02:00
terminal_config_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
terminal_copy_mode_acceptance.rs feat(view): horizontal scroll, text and decorations together 2026-08-07 22:43:17 +02:00
theme_faces_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
typed_edit_chain_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
vterm_stage1_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00
vterm_stage2_acceptance.rs fix(test): retire R2 and R4 — two readiness predicates weaker than their assertions 2026-08-05 13:41:05 +02:00
vterm_stage3_acceptance.rs fix(tests): eight version assertions the v22 bump broke, five of them defects 2026-08-07 20:15:33 +02:00
worker_shutdown_acceptance.rs test(isolation): migrate the corpus off the ambient roots 2026-07-31 18:48:45 -04:00