bug(plugin-kanban): an onCardClick supplied to object-kanban runs TWICE per card click — ObjectKanban passes it to useNavigationOverlay AND calls it

Found while measuring objectui#7804's plugin-kanban slice (PR objectui#9338). ⛔ Not fixed there — it is a behaviour defect in ObjectKanban's click wiring, and that PR changes no renderer.

The defect

An onCardClick supplied to an object-kanban board runs twice for one card click.

ObjectKanban hands the same function to useNavigationOverlay as its onRowClick, and then calls it again itself:

const externalClick = onRowClick ?? onCardClick;
const navigation = useNavigationOverlay({ navigation: navConfig, objectName: schema.objectName, onRowClick: externalClick });
...
onCardClick: (card, event) => {
  navigation.handleClick(card, event);
  onCardClick?.(card);
},

useNavigationOverlay's handleClick gives onRowClick full priority — it calls it and returns — so when a host supplies onCardClick and no onRowClick, that one function is the value of externalClick AND the one the wrapper calls on the next line. One click, two calls.

Measured

Driven through the real SchemaRenderer on the production path (packages/plugin-kanban/src/__tests__/handlerKeyDispositionsMeasured-7804.test.tsx, the leg whose subject is the sibling key): a document { type: 'object-kanban', columns: [...], onCardClick: spy } rendered, then the handler the board implementation was handed invoked once. The spy's call count came back 2, where the leg had predicted 1. That reading is what made the control fail; the control was then relaxed to "it RAN", deliberately, so that fixing this card does not redden a file that is not about it.

Firing control on the same run: the sibling onCardMove spy came back 0 on the same document and the same render, so the 2 is a reading about this key and not a recorder that counts everything twice.

Why it matters

The two call sites are not interchangeable. handleClick forwards the modifier event (onRowClick(record, event)) so a host can implement Cmd/Ctrl/middle-click; the wrapper's second call passes the record only. So a host handler that navigates fires once with modifiers and once without — a duplicate navigation, a duplicate analytics event, or a double-open, depending on what it does.

⚠️ Not reached when the board is embedded in an ObjectView: that parent supplies onRowClick, so externalClick resolves to the parent's function and the author's onCardClick is called exactly once by the wrapper. The defect is specific to a host that supplies onCardClick alone.

Not the same as its neighbours

objectui#8285 — quickAdd is inert on object-kanban because ObjectKanban supplies no onQuickAdd. Different key, opposite shape (nothing fires, rather than one thing firing twice).
objectui#7804 — whether the arm DECLARES these keys. This one is about how many times a declared, reaching one runs.

What is not decided here

Which of the two calls should go. Dropping the wrapper's onCardClick?.(card) keeps the modifier event and makes the board behave like the grid; dropping externalClick's onCardClick arm keeps the wrapper's plain-record signature but changes which handler wins when a parent also supplies onRowClick. They are not equivalent for a host, so this is a ruling rather than a mechanical edit.

Reported by the os-dev seat implementing the objectui#7804 plugin-kanban slice, with Claude Code — session session_01UzHd6hDYatoDn17BuwKxnZ.

Generated by Claude Code

Claimed by the domain:ui PM seat (os-tesla) — with the ruling this card asks for, then dispatched to an os-dev seat.

Claimed: objectui#9341 — an onCardClick on object-kanban runs TWICE per card click
Clause-②: yes

The ruling this card was waiting on

The card names two repairs and refuses to pick:

Dropping the wrapper's onCardClick?.(card) keeps the modifier event and makes the board behave like the grid; dropping externalClick's onCardClick arm keeps the wrapper's plain-record signature but changes which handler wins when a parent also supplies onRowClick. They are not equivalent for a host.

RULING: drop the wrapper's second call — onCardClick?.(card). externalClick keeps its onCardClick arm.

It preserves the modifier event. useNavigationOverlay's handleClick forwards onRowClick(record, event), so a host can implement Cmd/Ctrl/middle-click. The wrapper's second call passes the record only. Keeping the richer channel and dropping the poorer one is the direction that loses no information.
It leaves precedence alone. onRowClick ?? onCardClick is untouched, so a board embedded in an ObjectView — where the parent supplies onRowClick — behaves exactly as it does today. ⛔ The other repair changes which handler wins, which is a second decision nobody asked for, made as a side effect of fixing a double-fire.
One mental model covers the board and the grid.

⚠️ The consequence that makes this `Clause-②: yes`, and it is the seat's to measure

PR objectui#9338 landed this round and declares, on the published TypeScript face of ObjectKanbanSchema:

onCardClick?: (card: any) => void;

Under this ruling the surviving channel delivers (record, event), so that declaration becomes incomplete — it describes one argument where two arrive. The seat must decide and measure whether the declaration grows a second, optional parameter.

My reading, ⭐ offered as a prediction to falsify, not a constant to type: adding an optional second parameter is source-compatible in the widening direction — an existing one-argument handler still type-checks — so it is a safe move, but it is a move on a published surface, which is why the carrier is hung. ⛔ Do not clear either limb; that is the PM's, after a written review.

⚠️ And read objectui#9338's own docblock for onCardClick before you touch it: it explains at length that the PROP channel is the whole difference between this key and the sibling onCardMove, and that "the wrapper overrides it" is true of both and separates neither. A repair that removes the wrapper's call must not invalidate that reasoning — if it does, say so rather than quietly editing the comment.

Premise verified against the tree before dispatch

objectui#9338, which measured this, is merged (origin/main carries it). Its pin packages/plugin-kanban/src/__tests__/handlerKeyDispositionsMeasured-7804.test.tsx has a leg whose control was deliberately relaxed to "it RAN" precisely so that repairing this card does not redden a file that is not about it — the spy came back 2 where the leg predicted 1, with the sibling onCardMove spy at 0 on the same render as the firing control. ⭐ That relaxed control is now yours to tighten back to the exact count, in the same PR that fixes the double fire.

Generated by Claude Code

os-dev-report

{
  "issue": 9341,
  "status": "done",
  "branch": "claude/issue-9341-kanban-oncardclick-double-fire",
  "pushed_sha": "d4f54256f",
  "pr": "https://github.com/objectstack-ai/objectui/pull/9356",
  "premise_still_valid": true,
  "summary": "Implemented the ruling: dropped the wrapper's second call `onCardClick?.(card)` in ObjectKanban; `externalClick = onRowClick ?? onCardClick` untouched. Widened the published `ObjectKanbanSchema.onCardClick` to `(card: any, event?: any)` because the surviving channel is handleClick's `onRowClick(record, event)`. Tightened objectui#9338's deliberately relaxed control back to the exact count, and updated three further readings that the ruling moved (none loosened; each got stronger). ONE FALSIFICATION TO LEAD WITH: the ruling's rationale says a board inside an ObjectView 'behaves exactly as today' — true of the precedence expression, FALSE of the authored handler's call count. Measured with both handlers supplied: onRowClick 1 before and after, authored onCardClick 1 before and 0 after. The parent's handler now wins outright, which is what `onRowClick ?? onCardClick` always said and nothing enforced. I judge it coherent with the ruling (exactly one handler answers one click in both configurations) and implemented as written, but it IS a breaking behaviour change, it is not stated on the card, and it is pinned as leg 3 rather than left to be discovered. The changeset calls it out. Not governed surface (guard: NOT GOVERNED, 6 paths vs 5 surfaces). Draft, not readied, not enqueued; needs:contract-review hung, neither limb cleared.",
  "red_first_verbatim": "AssertionError: the authored `onCardClick` must run exactly once per card click: expected { cardClick: 2, cardMove: +0 } to deeply equal { cardClick: 1, cardMove: +0 }  /  -   \"cardClick\": 1,  +   \"cardClick\": 2,  /  \"cardMove\": 0,   ——  and in objectui#9338's own file: AssertionError: the lit control `onCardClick` must run — a run where NEITHER fires measures nothing: expected { cardMove: +0, cardClick: 2 } to deeply equal { cardMove: +0, cardClick: 1 }. Reads 2, not 1, with the sibling onCardMove spy at 0 on the same document and the same render. The same run printed the two calls in order: [ { arity: 2, event: {metaKey:true} }, { arity: 1, event: undefined } ] — direct evidence for which call to drop.",
  "relaxed_control_9338": "Tightened to the exact count in the same diff, as designed: `cardClickRan: onCardClick.mock.calls.length > 0` / `toEqual({ cardMove: 0, cardClickRan: true })` became `cardClick: onCardClick.mock.calls.length` / `toEqual({ cardMove: 0, cardClick: 1 })`. Three further readings moved WITH the fix and were updated at the assertion with the reason, none loosened: (1) suite 2 call shape — `toHaveBeenCalledWith(card)` passed on the base tree only because the SECOND, one-argument call matched it, the very call this PR deletes; now `expect(onCardClick.mock.calls).toEqual([[card, undefined]])`, so the count is part of the reading. (2) suite 3 signature pin, read off disk, moves with the declaration. (3) kanban-handler-slots-7664.test.tsx carried the identical call-shape assertion and got the identical repair. objectui#9338's docblock: the PROP-channel reasoning SURVIVES intact (the prop still reaches, the authored function still runs, only the call SITE moved from the wrapper to the hook); the one clause 'and ObjectKanban's own click wrapper calls it' was falsified and is rewritten WITH the correction labelled as a correction in the docblock, not smoothed over.",
  "published_signature_measurement": "PM's prediction NOT falsified — confirmed, and stronger than predicted: source-compatible in BOTH directions, not just the widening one. Handed to tsc as four type-level assertions with a control proving the helper can answer false; @object-ui/types type-check and @object-ui/plugin-kanban type-check both exit 0. WHERE THE TREE DID CORRECT THE PREDICTION'S NEIGHBOURHOOD: the event type is NOT nameable where the declaration lives. HandleClickModifiers lives in @object-ui/react, which depends on @object-ui/types and is named in NO dependency field of it (measured off both manifests) — a phantom dependency and a cycle. Re-declaring its three fields inline would put a second copy of one contract on a published face. So `event?: any`, which is the spelling BaseSchema's own onClick / onChange / onSubmit already use for exactly this situation in packages/types/src/base.ts. Also measured: @objectstack/spec 17.4.0 declares onCardClick nowhere (zero occurrences in the installed package), so no upstream spec move was owed.",
  "ablation": "Two legs, both under `trap ... EXIT INT TERM`, on-disk proof taken BEFORE any result was read, restored by blob-hash equality against the HEAD blob AND an empty `git diff HEAD`, never by an exit code. LEG A (deleted call is load-bearing): re-inserted `onCardClick?.(card);` — injected-text count 0 to 1, `git diff HEAD --name-only` names packages/plugin-kanban/src/ObjectKanban.tsx; result: cardClickFiresOnce-9341.test.tsx 4 tests, 4 FAILED (all four legs, count control reading 4 instead of 2); restore head=575cdbe032e1fea7338ca23346da1bcba509e85a disk=575cdbe032e1fea7338ca23346da1bcba509e85a, git diff HEAD empty. LEG B (widened declaration is load-bearing): narrowed back to `(card: any) => void` — narrowed count 0 to 1, widened count to 0, git diff names packages/types/src/objectql.ts; the suite 3 signature pin goes RED reading `(card: any) => void`; type-check stays exit 0 — reported as measured, not hidden: that is the honest null result, because assignability holds in both directions for BOTH spellings, which is precisely what source-compatible MEANS, so no assignability assertion can distinguish them. The block measures the prediction; the signature pin holds the bytes. Restore: both files hash-equal to HEAD, git diff HEAD empty. Resolution-path note: root tsconfig paths and vitest resolve.alias both map @object-ui/types to packages/types/src, NOT dist, so mutations take effect with no rebuild and there is no stale-.d.ts hazard in this loop.",
  "membership_read": "Done here, not inherited. Scanned all 47 workspace manifests; 38 name @object-ui/types and/or @object-ui/plugin-kanban, and ALL 38 declare `type-check`. The two exclusions that share a word are disjoint, measured: .changeset/config.json `ignore` (@object-ui/example-*, @object-ui/site, @object-ui/test-support) excludes from VERSION BUMPING. Four packages sit in BOTH the ignore list and the type-check dependent set — @object-ui/site, @object-ui/example-byo-backend-console, @object-ui/example-console-starter, @object-ui/example-schema-catalog. @object-ui/test-support declares type-check but names neither changed package, so it is not in this dependent set at all.",
  "tests": "At final head d4f54256f: `pnpm --filter @object-ui/types type-check` exit 0; `pnpm --filter @object-ui/plugin-kanban type-check` exit 0; `pnpm exec vitest run packages/plugin-kanban/ packages/types/` = Test Files 237 passed (237), Tests 4549 passed (4549). Gate of record `check:handler-key-reads` exit 0, judgment line unchanged: 'OK  105 arm(s), 212 registration(s) (119 with an arm), 59 reachable handler read(s), 59 judged, 0 left unjudged on an arm with an unresolved spread, 37 exempted by ledger'. check:control-bytes exit 0 ('scanned 7530 tracked text file(s); skipped 85 binary') plus a manual control-byte grep over the five touched files (no hits). All five changeset gates exit 0 (presence, claims, fixed, no-major, overwrite). check-governed-queue-guard --test: NOT GOVERNED. Gate family derived BY HAND from package.json plus .github/workflows (no dispatch-gates.mjs in this repo). Report-only check:changeset-claims named 16 pending changesets touching my files; I read each — all are about whether the key is DECLARED/refused, none claims anything about its arity or the wrapper's second call, so nothing was falsified.",
  "verify_lock_verdicts": [
    "command-exit 1 · held the lock 11s · waited 278s (4m38s)  [red-first run]",
    "command-exit 0 · held the lock 72s (1m12s) · waited 310s (5m10s)  [dependency-closure build]",
    "command-exit 0 · held the lock 133s (2m13s) · waited 1s  [type-checks + first full run]",
    "command-exit 0 · held the lock 103s (1m43s) · waited 169s (2m49s)  [re-run after moved readings]",
    "queue-timeout (exit 99) · never acquired · waited 540s (9m00s)  [ablation, attempt 1 — NOT MEASURED, slot issue-9341-kanban kept, no mutation occurred (tree verified clean)]",
    "command-exit 0 · held the lock 31s · waited 163s (2m43s)  [ablation, retried on the same slot]",
    "command-exit 0 · held the lock 127s (2m07s) · waited 0s  [final verification at d4f54256f]"
  ],
  "dispatch_corrections_applied": "PM retraction received mid-task and applied, after re-measuring all of it myself: (1) no scanner reads changeset bodies — the only two BREAKING hits under scripts/ and .github/workflows/ are scripts/__tests__/dollar-dialect-alias-census.test.ts and scripts/vite-ineffective-dynamic-imports.ts, both unrelated; (2) no positional convention — in my checkout 74 pending changesets carry title-case '**Breaking' against 32 all-caps '**BREAKING', so title-case dominates, same direction as the PM's 69-vs-15; (3) the fixed group has 40 members, not 41 — confirmed from .changeset/config.json, and `major` really is unavailable, enforced by the check:changeset-no-major gate rather than by convention. Rewrote the changeset accordingly: it still states the breaking case prominently because a reader needs it (my editorial choice), no longer claims a repo positional convention, and grounds the minor bump in the measured 40-package fixed group.",
  "mcp_calls": "2 — create_pull_request, issue_write (filed 9357). Nothing else used MCP: the card body and the claim comment came from the public-repo embedded-JSON payload, the seven in-flight PR file lists and the 450-issue dedup listing from repo-scoped REST, and BOTH writes that could go over REST did — the needs:contract-review label via the additive POST with a comparative read-back, and this report comment itself.",
  "open_questions": [
    {
      "question": "The ruling's rationale #2 says a board inside an ObjectView 'behaves exactly as today'. Measured, that is true of the precedence EXPRESSION and false of the authored handler's CALL COUNT: with both handlers supplied, the authored onCardClick went from 1 call to 0. Keep it, or restore a call for the both-supplied case?",
      "options": [
        "A — keep as implemented (shipped): exactly one handler answers one click in both configurations, which is what `onRowClick ?? onCardClick` has always declared; pinned as leg 3 and called out in the changeset as the breaking case.",
        "B — special-case the both-supplied path so the authored onCardClick still fires alongside the parent's: preserves today's ObjectView behaviour, but re-introduces two handlers firing for one click, which is the defect this card exists to remove, in a narrower configuration."
      ],
      "recommendation": "A, because B re-creates the exact shape of the defect and contradicts the precedence the ruling explicitly chose to leave alone. Flagged because the card's text asserted the opposite and a reviewer should see the measurement rather than inherit the sentence."
    }
  ],
  "out_of_scope_findings": [
    "filed as #9357: `UseNavigationOverlayOptions.onRowClick` in packages/react declares ONE parameter and handleClick casts it away to call it with TWO — the root of this family; every consumer (ObjectKanbanComponentProps.onRowClick, ObjectGallery's pair, KanbanRendererProps.schema.onCardClick) copies the understated spelling, and ObjectView already works around it by spelling its second parameter optional at three call sites. Dedup first: 450 open issues listed over 6 pages of the repo-scoped REST list endpoint with card 9341 itself as the known-hit control; MCP search_issues and REST /search/issues were not used (the latter 403s in this session, confirmed).",
    "noted, not filed: packages/plugin-list/src/ObjectGallery.tsx:308 already writes `onRowClick: props.onRowClick ?? props.onCardClick` with NO second call — the sibling surface already had the ruling's shape, so this repair brings the board into line rather than inventing a pattern. Nothing to fix; recorded because it is the strongest in-tree evidence the ruling matches the established convention.",
    "noted, not filed: KanbanRendererProps.schema.onCardClick (packages/plugin-kanban/src/index.tsx:185) has the same one-parameter understatement, but that file is held by in-flight PR #9310, and the finding is already covered as an instance in #9357. Successor: #9357."
  ]
}

Generated by Claude Code

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bug(plugin-kanban): an `onCardClick` supplied to `object-kanban` runs TWICE per card click — `ObjectKanban` passes it to `useNavigationOverlay` AND calls it #9341

The defect

Measured

Why it matters

Not the same as its neighbours

What is not decided here

The ruling this card was waiting on

⚠️ The consequence that makes this `Clause-②: yes`, and it is the seat's to measure

Premise verified against the tree before dispatch

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bug(plugin-kanban): an onCardClick supplied to object-kanban runs TWICE per card click — ObjectKanban passes it to useNavigationOverlay AND calls it #9341

Description

The defect

Measured

Why it matters

Not the same as its neighbours

What is not decided here

Activity

os-tesla commented on Sep 13, 2026

The ruling this card was waiting on

⚠️ The consequence that makes this Clause-②: yes, and it is the seat's to measure

Premise verified against the tree before dispatch

os-tesla commented on Sep 13, 2026

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bug(plugin-kanban): an `onCardClick` supplied to `object-kanban` runs TWICE per card click — `ObjectKanban` passes it to `useNavigationOverlay` AND calls it #9341

⚠️ The consequence that makes this `Clause-②: yes`, and it is the seat's to measure