The per-row copy control lived in the header's trailing slot as a 24px
button that depended on a `group-hover/tool-row` group that exists nowhere
in the tree. It therefore stayed `opacity-0` yet remained clickable — an
invisible hit-target straddling the disclosure caret and duration, making
the caret hard to click without firing a copy.
Move copy into the expanded body's top-right (matching the code-block
convention) where it can't fight the caret for the right edge, and make it
actually visible (subtle at rest, full on hover/focus). The header right
edge now belongs solely to the duration label + caret.
Tradeoff: copy is only reachable once a row is expanded; rows with no
expandable body no longer surface a copy control.
Arabic/Hebrew/Persian/Urdu chat text rendered left-to-right and
left-aligned, and mixed RTL/English technical messages (the common case)
read backwards. Resolve each chat block's base direction from its own
first strong character (UAX#9) with pure CSS, scoped to the chat
surfaces only:
- `unicode-bidi: plaintext` + `text-align: start` on assistant prose
blocks (p, h1-h6, li, blockquote), the user bubble's text lines, and
both composers (main + edit share the composer-rich-input slot). RTL
blocks read and right-align RTL; English stays LTR; mixed
conversations resolve per block. `text-align: start` is required
because the user bubble hardcodes `text-left`.
- Inline `code` and KaTeX are pinned `direction: ltr; unicode-bidi:
isolate`, so the bidi first-strong heuristic skips them: a sentence
that *starts* with a command (`./run.sh ...`) followed by Arabic
still resolves RTL, and the command's own neutrals keep their order.
- Fenced code surfaces (code-card, user fences) are pinned LTR so they
never mirror or right-align inside an RTL list item or blockquote.
`direction` is never forced, so app chrome, layout, and list indent
stay LTR per the issue's request not to flip the whole UI. English-only
content is byte-for-byte unchanged.
Salvaged and unified from #44065 and #44169; verified in Chromium that
isolate removes inline code from the paragraph direction vote (the
code-first case), making the JS dir-resolution in #44065 unnecessary.
Fixes#44150
Co-authored-by: Adolanium <Adolanium@users.noreply.github.com>
Co-authored-by: Adalsteinn Helgason <AIalliAI@users.noreply.github.com>
Tell coding agents to activate shell setup once per session instead of re-sourcing it before every command, and pin the existing LocalEnvironment env-snapshot behavior with regression tests.
Port from anomalyco/opencode#31271: only call tools/list when the server
advertises the 'tools' capability in InitializeResult.capabilities.
Previously, _discover_tools() unconditionally called session.list_tools()
right after initialize. Prompt-only / resource-only servers (which omit
the tools capability per the MCP spec) raise McpError(-32601 Method not
found), which aborted the connection — burning all 3 initial-connect
retries and permanently failing the server even though its prompts and
resources were perfectly usable. The 180s keepalive had the same problem:
it probed with list_tools(), so even a successfully connected prompt-only
server would be torn down on the first keepalive cycle.
Changes:
- MCPServerTask._advertises_tools(): capability check with a legacy
fallback (no captured InitializeResult -> behave as before)
- _discover_tools(): skip tools/list for non-tool servers
- keepalive: use the universal ping request for non-tool servers
- _refresh_tools(): guard against tools/list_changed from non-tool servers
E2E verified with a real stdio prompt-only FastMCP-style server: on main
it fails all 3 connection attempts with Method-not-found; with this fix
it connects, lists prompts, answers ping keepalives, and shuts down
cleanly.
The desktop "Local / custom endpoint" onboarding never collected an API
key and /api/model/set silently dropped one, so an auth-gated endpoint
(e.g. a hosted vLLM behind a key) could never enumerate models — and
Settings' "Set up custom endpoint" routed `custom` into a non-existent
OAuth flow, booting the user back to the first screen (the reported loop).
Backend (web_server.py):
- /api/providers/validate accepts an optional api_key and sends it as a
Bearer header when probing a custom endpoint's /v1/models.
- /api/model/set accepts api_key, persists it to model.api_key (same
switch/preserve lifecycle as base_url), and registers a named
custom_providers entry via _save_custom_provider — matching the
`hermes model` CLI flow so the endpoint shows up as a ready picker row.
Desktop:
- ApiKeyForm shows an optional API key field for the local/custom option;
the key is threaded through saveOnboardingLocalEndpoint → validate +
setModelAssignment.
- New onboarding `localEndpoint` intent + startManualLocalEndpoint(); the
Settings "Set up custom endpoint" button now opens the local-endpoint
form (URL + key) instead of the OAuth dead-end.
- Added localApiKeyPlaceholder i18n key (en + types + zh).
Tests: api_key lifecycle on _apply_main_model_assignment, key persistence
+ custom_providers registration on /api/model/set, Bearer-header probe;
onboarding store forwards + persists the key.
Cherry-picked from #39840 by @flyinhigh and rebased cleanly on main.
- Defer config fetch in createGatewayEventHandler until gateway.ready to
avoid render-phase RPC that can mutate transcript state and trigger
React error 301 in embedded dashboard PTYs.
- Use undici WebSocket fallback when globalThis.WebSocket is unavailable
(Node attach mode and sidecar mirror sockets).
- Add regression tests for both fixes.
Co-authored-by: flyinhigh <flyinhigh@users.noreply.github.com>
Collapse the verbose multi-line rationale comments across the TUI/desktop/
backend approval surfaces into single-line "why" notes, and derive
APPROVAL_OPTS_NO_ALWAYS from APPROVAL_OPTS instead of re-listing it.
No behavior change.
Node >=18 / Electron 40 ship fetch; the hand-rolled http/https.request
plumbing buys nothing. AbortSignal.timeout replaces the socket timeout,
protocol guard and >=400 rejection semantics preserved. 13/13 unit
tests and the live web_server.py repro both green over the new
transport.
Both spawn paths (startHermes, spawnPoolBackend) duplicated the same
resolve -> log-fallback -> foreign-check -> throw dance. Collapse it into
adoptServedDashboardToken(baseUrl, spawnToken, {childAlive, label}) in
dashboard-token.cjs; childAlive is a thunk so liveness is sampled after
the fetch. Drop the redundant backendPool.delete in the pool's throw
path (the child exit/error handlers already own pool eviction).
Validated end-to-end against a real web_server.py backend, not just
units: token-injection regex vs the actual served index.html, foreign
refusal (dead child + live squatter), benign drift adoption, and the
401-vs-200 token auth split on /api/sessions.
When a tirith content-security warning is present the approval backend
forces allow_permanent=False and silently downgrades an "always" choice to
session scope (the persistence loop in check_all_command_guards only honors
"always" → permanent when no tirith finding exists). But the gateway notify
payload that drives the TUI and the Electron desktop app never carried that
flag, so both surfaces always rendered "Always allow" — offering a permanent
allow the backend would quietly refuse to persist.
Plumb allow_permanent end-to-end:
- tools/approval.py: include `allow_permanent: not has_tirith` in the gateway
approval_data the notify callback emits as `approval.request`.
- ui-tui: thread `allowPermanent` through the event handler, gateway types,
and ApprovalReq; ApprovalPrompt drops the "always" option (and renumbers the
quick-pick keys) when it's false.
- apps/desktop: thread `allow_permanent` through the gateway payload type, the
per-session approval store, and the inline ApprovalBar, which now hides the
"Always allow…" dropdown item when permanent allow is disallowed — reusing
the existing DropdownMenu / confirm-Dialog UI.
The desktop/TUI render path for approvals already landed in #38578 (the root
cause of approvals not surfacing in the GUI); this completes the salvage of
#37856 by carrying allow_permanent across both surfaces. #37856's original
thread-local _block() approach is dropped: desktop/TUI approvals resolve via
approval.respond → resolve_gateway_approval (the per-session queue), not the
_block()/request_id correlation, so a worker-thread callback waiting on _block
would never be released by the real UI.
Tests: gateway notify payload carries allow_permanent (True without tirith,
False with a tirith warning); ui-tui approvalAction reduced option set +
event-handler allowPermanent propagation; desktop store round-trip + the
ApprovalBar showing/hiding "Always allow".
Supersedes #37856Closes#37812
Co-authored-by: LeonSGP43 <cine.dreamer.one@gmail.com>
Two fixes to the Electron desktop launch path, with the port-reservation logic extracted into a unit-tested module:
1. hermes:bootstrap:reset ("Reload and retry") only cleared connectionPromise, leaving the live backend alive; the orphan kept binding PORT_FLOOR (9120) so the next startHermes() hit EADDRINUSE / "Object has been destroyed" and the window looped. Await teardownPrimaryBackendAndWait() so the reset stops the old backend before restarting.
2. pickPort() probes-then-closes a socket before the real bind happens in a separate Python child, so two concurrent spawns (primary + pool backend) could both be handed PORT_FLOOR and one died with EADDRINUSE. The reservation bookkeeping is extracted into electron/port-pool.cjs (PortPool): pickPort() reserves the chosen port until the child exits and releases it on every exit/error/throw-before-spawn path, closing the TOCTOU window.
PortPool is dependency-injected (probe passed in) and socket-free, unit-tested in electron/port-pool.test.cjs (8 cases) and wired into the test:desktop:platforms script.
(cherry picked from commit d4133945b9)
The served-token fallback adopts whatever token the dashboard HTML
injects. That is correct when our own child regenerated the token (env
pin lost across a shell-wrapped spawn), but wrong when the readiness
probe answered from a process we did not spawn: /api/status is public,
so an orphaned dashboard squatting the port passes waitForHermes while
our child dies on the bind conflict. Silently adopting that process's
token would authenticate the renderer against a foreign backend,
possibly on the wrong profile.
Discriminate on child liveness: the desktop pins
HERMES_DASHBOARD_SESSION_TOKEN on every spawn, so a live child always
serves our token. Served-token mismatch + dead child = foreign backend;
fail the boot loudly instead of connecting. Mismatch + live child keeps
the adopt-served-token salvage from #43720.
`@assistant-ui/store`'s index-keyed child-scope lookup (`tapClientLookup`)
throws — rather than returning undefined — when a subscriber reads an index
the message/parts list no longer has. During high-frequency store replacement
(switching sessions mid-stream, gateway reconnect replay) a subscriber from
the previous, longer list is still in React's notification queue and reads one
slot past the new, shorter array before it can unmount. The throw
(`Index N out of bounds (length: N)`, the classic index === length off-by-one)
unwinds all the way to the root error boundary and blanks the entire window,
even though the store self-heals on the very next consistent snapshot.
Wrap each virtualized message group in a tiny boundary that swallows ONLY this
transient lookup race and auto-recovers when the message signature changes
(the existing list-mutation key). Any other error re-throws to the root
boundary, so genuine bugs still surface.
Upstream-tracked and unresolved: assistant-ui/assistant-ui#4051, #3652.
Co-authored-by: mollusk <mollusk@users.noreply.github.com>
Desktop spawns its dashboard backend with `--profile <name>` and
`HERMES_DESKTOP=1`. cmd_dashboard's unified-launch routing treats any
named profile as a request for the shared machine dashboard: it re-execs
as the default profile (dropping HERMES_HOME) or, when one is already
listening, prints "Machine dashboard already running ... Managing profile
'<name>'" and exits 0. Either way the desktop-spawned child exits before
the app sees a ready backend, so Desktop retries forever — the Windows
named-profile boot loop in the post-mortem.
Skip the machine-dashboard reroute when HERMES_DESKTOP=1 so desktop pool
backends stay per-profile (which is what the pool expects). Carved out of
#44478.
Co-authored-by: AJ <yspdev@gmail.com>
The desktop chat surface talks to the dashboard's in-process /api/ws
gateway, which builds agents through tui_gateway.server._make_agent. That
path only snapshots the existing tool registry — MCP discovery is started
by tui_gateway/entry.py (the stdio TUI), which the dashboard process never
runs. So a profile's configured MCP servers never connect under the
desktop app and sessions show no MCP tools.
Start a shared background MCP discovery thread at dashboard startup (via
hermes_cli.mcp_startup, bounded so a slow/dead server can't block boot),
and have _make_agent briefly join that thread in addition to the existing
entry-owned TUI thread before snapshotting tools.
Carved out of #44478.
Co-authored-by: AJ <yspdev@gmail.com>
The deploy-site skills index crawl was capped at ~3k ClawHub entries
because CATALOG_WALK_BUDGET_SECONDS applied to max_items=0 walks too.
Only enforce the wall-clock budget for bounded browse requests and pass
limit=0 from build_skills_index so CI walks the full catalog.
Co-authored-by: Cursor <cursoragent@cursor.com>
* docs: finish Automation Blueprints terminology rebrand
Replace leftover "Automation Templates" wording from the Cron Recipes
rebrand, rename the copy-paste cookbook guide to Automation Recipes, and
point the marketing gallery link at the blueprints catalog.
Co-authored-by: Cursor <cursoragent@cursor.com>
* docs: use Automation Blueprints instead of Recipes in guide
Rename the cookbook guide from automation-recipes to
automation-blueprints so sidebar and copy match the product term.
Co-authored-by: Cursor <cursoragent@cursor.com>
* docs: rename automation-blueprints-catalog to automation-blueprints
Drop the -catalog suffix from the reference page slug and title, and
move the copy-paste cookbook to automation-blueprint-examples so the
main Automation Blueprints doc is unambiguous.
Co-authored-by: Cursor <cursoragent@cursor.com>
* Revert "docs: rename automation-blueprints-catalog to automation-blueprints"
This reverts commit 605f1eeab5.
---------
Co-authored-by: Cursor <cursoragent@cursor.com>
Legibility pass on the consolidated prefix: collapse the topic-overlap rule
from three overlapping sentences into one WINS sentence + one discard/no-wrap-up
sentence (same constraints, less dilution), fix the module docstring to
describe the headings that actually shipped, and correct the #10896 comment's
heading name (Historical Pending User Asks).
The prompt consolidation above retires the carveout-era prefix. Without a
frozen copy in _HISTORICAL_SUMMARY_PREFIXES, summaries persisted by
pre-upgrade builds would lose detection (_is_context_summary_content) and
renormalization (_strip_summary_prefix) — the exact regression class the
tuple exists to prevent. Adds contract tests covering every frozen prefix.
Refs #41607#38364#42812
A WSL2 user reported the top two left-sidebar items being unclickable
while the rest of the UI works. That symptom shape matches an
-webkit-app-region:drag hit-test band eating clicks, not GPU/compositing:
the shell's titlebar drag strips (app-shell.tsx) span the top 34px and
the nav group clears them by only 6px, and drag regions win hit-testing
over DOM regardless of pointer-events. Linux WCO (Electron >=32) is the
newest implementation and has known region quirks (electron#43030).
Apply the same no-drag carve-out the codebase already uses for sticky
user bubbles (USER_BUBBLE_BASE_CLASS in thread.tsx) to the sidebar nav
buttons. Harmless on every platform: the rows were never meant to be
draggable surface.
Root-cause hardening for the stranded-empty-registry failure behind
'No web search/extract provider configured': discover_and_load() set
_discovered=True before scanning, so a sweep that raised partway was
swallowed by callers as a warning and every later call early-returned
against an empty registry for the process lifetime. The flag now acts
only as a re-entrancy guard and is reset when the sweep raises, so the
next call retries discovery.
Pins the invariant that _ensure_web_plugins_loaded registers the keyless
Parallel default (and the wider bundled set) even when the general plugin
discovery raises, that the direct-registration fallback honors plugins.disabled,
and that it stays a no-op on the healthy path.
web_search/web_extract are documented to work with zero setup via the bundled
keyless Parallel free-MCP backend, but that only holds when the bundled
plugins/web/* providers are registered. The dispatch relied entirely on the
general plugin sweep to do that; when the sweep finishes without registering
them (its exception swallowed as a warning, a packaged layout where it ran
before the bundled tree was importable, or a stale empty-discovery cache), the
registry is empty and BOTH tools dead-end on "No web {search,extract} provider
configured" — despite needing no setup at all.
_ensure_web_plugins_loaded now verifies the keyless default landed after the
sweep and, if not, registers the bundled web providers directly against the
registry. Idempotent, a no-op on the healthy path (one dict lookup), and honors
an explicit plugins.disabled entry.
* fix(discord): recover from runtime gateway task exits
Salvaged from #39416 (AMEOBIUS) — cherry-picked only the task-exit
recovery; the original PR was 1081 commits behind with 28 unrelated
commits.
A post-ready discord.py WebSocket crash left the gateway split-brained:
producers stayed active while Discord stopped responding. After this fix
the adapter calls _set_fatal_error(retryable=True) + _notify_fatal_error()
so the existing GatewayRunner reconnect watcher replaces the dead adapter.
Also adds _wait_for_ready_or_bot_exit() so startup failures (SOCKS/proxy
errors, invalid tokens) surface fast instead of burning the full ready
timeout. Because connect() no longer waits via asyncio.wait_for on that
path, test_connect_releases_token_lock_on_timeout is updated to trigger
the timeout through the new helper (same lock-release contract).
3 tests pass (2 new runtime-failure tests + the updated timeout test);
test_discord_connect.py and test_discord_slash_commands.py green.
Co-Authored-By: ameobius <ameobius@local.host>
* fix(test): patch _wait_for_ready_or_bot_exit in timeout cancel test
connect() no longer uses asyncio.wait_for for the ready handshake, so
test_connect_timeout_cancels_bot_task was hanging for 30s in CI.
Co-authored-by: Cursor <cursoragent@cursor.com>
---------
Co-authored-by: ameobius <ameobius@local.host>
Co-authored-by: Cursor <cursoragent@cursor.com>
Follow-up to #44389: the generic 'except Exception' branch in connect()
had the same orphaned-task hazard as the timeout branch. Extract the
cancel-and-await logic into _cancel_bot_task() and call it from all
three sites (timeout branch, exception branch, disconnect()).
Also adds deaneeth to AUTHOR_MAP.
When connect() times out waiting for the Discord ready event, the background
asyncio.Task running client.start() was not cancelled. discord.py's internal
reconnect loop can ignore client.close() while a WebSocket handshake is in
flight, so the orphaned task eventually completes and fires on_ready.
A later successful reconnect then leaves two live Discord clients in the same
process — each with its own on_message handler and MessageDeduplicator instance
— so every @mention creates two threads because the per-adapter dedup caches
cannot catch cross-client duplicates.
Fix: explicitly cancel and await _bot_task in two places:
1. The asyncio.TimeoutError handler inside connect() — catches the case where
the adapter's own inner wait_for fires before the gateway's outer timeout.
2. The start of disconnect() — the load-bearing path, always reached via
_dispose_unused_adapter regardless of which timeout fired first.
Root cause confirmed from production logs: a Jun 8 network outage caused three
consecutive connect() timeouts. The first attempt's bot_task completed its
handshake 4 minutes later ("Connected as") with no preceding watcher line,
then the watcher's real reconnect also connected 90 seconds after that. The two
clients ran continuously for 41+ hours, confirmed by the same user message
appearing as two separate inbound events in two different thread IDs 357ms apart.
Regression tests added to tests/gateway/test_discord_connect.py:
- test_connect_timeout_cancels_bot_task: simulates a connect() timeout with a
NeverReadyBot and asserts _bot_task is None afterward
- test_disconnect_cancels_running_bot_task: injects a live zombie task, calls
disconnect(), and asserts the task is cancelled and the attribute cleared
Sibling site of the PDF/DOCX note fixed in PR #44175: the audio file
attachment context note led with "Ask the user what they'd like you to
do with it", steering the model into asking instead of transcribing.
Rewritten to instruct the agent to transcribe/process the file itself
when the request involves its content, only asking when intent is
genuinely unclear. Contract assertion added to the existing audio
attachment note test.
Pin the contract for _build_document_context_note: text documents confirm the
inlined content and record the path; binary documents (PDF/DOCX/XLSX/octet-
stream) tell the agent to extract the text itself and never instruct it to ask
the user to paste the contents.
When a user attached a binary document (PDF, DOCX, XLSX, …) in chat, the
context note prepended to the turn said "Ask the user what they'd like you to
do with it." That steered the model into asking the user to paste the
contents rather than extracting the text it is fully capable of reading — so
attached PDFs/DOCX appeared "unreadable" to the agent.
Rewrite the binary-document note to tell the agent the file is a non-text
format saved at the given path and to extract its text itself (e.g. via the
terminal tool or the ocr-and-documents skill) before answering. Text
documents (whose content is already inlined by the platform adapter) keep
their existing note. The note construction is pulled into a small
`_build_document_context_note` helper so it is unit-testable.
Set CI=1 in _run_npm_install_deterministic so the package's /dev/tty
postinstall demo is skipped during hermes dashboard web UI builds.
Co-authored-by: Cursor <cursoragent@cursor.com>
* fix(desktop): stop file tree throwing "two HTML5 backends" on remount
The Agent Workspace file tree (react-arborist) shows a permanent "TREE ERROR"
with `[error-boundary:file-tree] Cannot have two HTML5 backends at the same
time.` react-arborist mounts its own react-dnd DndProvider + HTML5Backend per
<Tree>. react-dnd v14 keeps that manager on a global, ref-counted singleton
context and nulls it when the count reaches 0. The tree is keyed on
`${cwd}:${collapseNonce}`, so changing folder / collapsing forces a fresh
<Tree>; during the remount the singleton can be torn down and recreated while
the previous HTML5Backend still owns `window.__isReactDndHtml5Backend`, so the
new backend's setup() throws. The error boundary then sticks, because "Try
again" just remounts into the same race.
Pass arborist a stable, app-lifetime `dndManager` (new getFileTreeDndManager
singleton) so it reuses one backend for the life of the app and never
double-claims the window flag. Drag/drop is already disabled on this tree;
this only changes how the (unused) dnd backend is provisioned.
Promotes dnd-core and react-dnd-html5-backend to explicit deps (already present
transitively via react-arborist's react-dnd 14.x line, so they dedupe to one
instance).
* fix(nix): bump npmDepsHash for desktop dnd deps
Adding dnd-core / react-dnd-html5-backend changed the workspace
package-lock.json, so the single workspace-root npmDepsHash in
nix/lib.nix was stale and the nix build failed. Regenerate it
(hash from the failing nix CI job's 'got:' value).
* fix(nix): update npmDepsHash for merged lockfile
After merging main, the workspace lockfile combined main's dep
changes with the desktop dnd additions, so the npmDepsHash needed
recomputing again. Hash from the nix lockfile-check job.
* fix(nix): use fetchNpmDeps hash for desktop dnd lockfile
prefetch-npm-deps reported sha256-lVnybH9RE/... but fetchNpmDeps
wants sha256-mYgKXE/FL4hnkrEvpVv+ULM/oeyIfO2AM9Ol8OrfWm0= for the
merged workspace lockfile. Use the nix build 'got:' hash so CI passes.
---------
Co-authored-by: Brooklyn Nicholson <brooklyn.bb.nicholson@gmail.com>
When a user toggles off the last visible model for a provider group, the
effectiveVisibleKeys() function treated the missing provider prefix as
'never customized' and re-added the default models on the next render,
causing all models to snap back to enabled.
Fix: store a sentinel key (e.g. 'provider::') when the last model for a
provider is toggled off. The sentinel distinguishes 'user hid everything'
from 'user never customized', preventing the default-fallback path from
re-adding models the user explicitly chose to hide.
Fixes#43485
Turn off browser spellcheck, autocorrect, and autocomplete on the main chat composer and message-edit composer so code, paths, and slash commands are not flagged or altered.
The coding-posture brief told GPT/Codex models to use patch mode='patch'
(V4A) for structured/multi-file changes but mode='replace' "for a single
small swap". That second nudge points those models at a format their
first-party harness never taught them.
Verified against openai/codex (current main): apply_patch is the ONLY file
editor in codex-rs — zero occurrences of str_replace/old_string anywhere in
the repo; the grammar (core/src/tools/handlers/apply_patch.lark) is exactly
the V4A dialect our patch_parser implements; the shipped model prompts
(gpt_5_codex, gpt-5.2-codex, gpt-5.1-codex-max + instruction templates)
explicitly say to use apply_patch "for single file edits"; and the tool is
gated per model via ModelInfo.apply_patch_tool_type, i.e. OpenAI ships
V4A-for-everything as model metadata.
The GPT-family line now steers to mode='patch' for all edits, single-file
included. The replace-family line (Claude + open-weight) is unchanged —
Claude Code's FileEdit is old_string/new_string/replace_all exact string
replacement (confirmed from Anthropic's shipped sdk-tools.d.ts, the only
file editor in its tool union), matching our mode='replace'.
CI tests the PR merged with current main, where the new /memory canonical
command filled Slack's 50-slash cap: with btw/bg/reset all pinned ahead of
canonicals, the last canonical (/debug) got clamped and the Telegram-parity
test failed. Canonical commands must win slots over alias spellings — /new
keeps its native slot and 'reset' stays reachable via /hermes reset.
Also updates test_includes_aliases_as_first_class_slashes to assert the
pinned-alias contract (_SLACK_PRIORITY_ALIASES survive) instead of a
specific unpinned alias's survival, which was the same change-detector
pattern the docstring already warned about.
