fix(blocks-engine): a reference follows the node the page renders - #1876
fix(blocks-engine): a reference follows the node the page renders#1876mobeenabdullah wants to merge 4 commits into
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A saved forest holding a visible target and a condition-gated namesake with the same current id counted both as renderers. With the visible one restored and the gated one kept, the id looked contested, so an unrelated reference fell to its holder and kept an id nothing renders once the gated node is pruned. Outcomes are now noted in two maps split by hiddenSubtreeNodes, the renderer's own pruning rule with inherited gating. settledTarget decides what a reference follows: visible renderers whenever any carries the id, gated ones only where none does, so a link to a target gated today is not split from it when the gate opens. A gated node still has its own id restored.
… shows The changeset for the reference-target fix, which changes what a saved pattern stores when a visible element and a gated copy share one id.
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| */ | ||
| function settledTarget(each: EachCopy, value: string): string | undefined { | ||
| const visible = each.outcomes.get(value); | ||
| if (visible !== undefined) return soleOutcome(visible); |
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When a restored target and its reference are inside the same gated subtree, but an unrelated visible node carries the same current ID, this early return forces every reference to follow the visible namesake. The gated target can be restored from shared-1 to shared while its governed reference remains shared-1, so once the gate opens the stored pattern points at the unrelated node instead of its target. Consult the holder's restoration for references in the gated subtree rather than unconditionally letting any visible outcome override it.
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Reproduced and fixed in ce2c738.
Reproduction (failing before the change).
tree.reid-with-map.test.ts— "lets a link inside a gated subtree follow the target it renders with": an unrelated visibleshared-1, and a gated container holding the target (restoring toshared) and its governed link. Before: the link keptshared-1.- "counts every gate above a link, not only the nearest": the target under an outer gate, the link under that gate and an inner one. Before:
shared-1. composition-planners.test.ts— "restores a pattern's link inside a gated container beside a visible namesake", throughplanSaveAsPatternwith the container gated. Before: the link kept the minted id.
Fix — the rule stays "follow the target", with the target defined as what renders whenever the link does. A reference renders only when every gate above it is open; then so does everything ungated and every node behind a gate that is also over the reference. Those nodes settle it: agree → the reference takes their id; disagree → its holder decides; none of them carries the id → every carrier decides (so a link to a target gated today is not split from it when that gate opens). This needs to know which gate covers each node, so hiddenSubtreeNodes is now derived from that reading rather than computed beside it.
Why not let the holder decide for every reference inside a gate. That splits the opposite case: a gated container holding the link and an unlisted namesake that keeps shared-1, with nothing visible carrying it. The holder would restore the link while the only node rendering with it keeps the old id. The control "keeps a gated link on the one node that renders with it" passes here and fails under holder-first.
Break-verified. 19 wrong implementations, each type-clean and each failing at least one test. The six aimed at this rule: only the nearest gate counted (fails "counts every gate above a link"), the holder gates ignored (3 tests incl. this reproduction), no fallback when nothing renders alongside (fails the gated-only control), gates ignored entirely (3), gating not inherited (fails the inherited test), holder decides inside a gate (fails "keeps a gated link on the one node that renders with it").
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Letting visible renderers settle every reference handed a reference inside a gated subtree to an unrelated visible namesake. With the gated target restored beside it, the pattern's own link kept the old id and pointed at the namesake once the gate opened. A reference renders only when every gate above it is open, and then so does every node behind those same gates and everything ungated. Those nodes now settle it: where they agree the reference takes their id, where they disagree its holder decides, and where none carries the id every carrier decides. hiddenSubtreeNodes is derived from a new reading of the gates over each node, so which nodes are pruned and which gates prune them come from one walk.
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📝 WalkthroughWalkthroughThe change makes DOM-id restoration aware of condition gates. It groups restoration outcomes by gate, resolves references using shared rendering conditions, and adds tests for gated namesakes, targets, ancestors, and links. ChangesGate-aware restoration
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to Documents that reuse a node in both visible and conditionally gated positions can leave visible references pointing at stale IDs. Preserve gate context per occurrence before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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In `@packages/blocks-engine/src/tree.ts`:
- Around line 1844-1845: Update walkNodes/mapForest gate tracking to preserve
conditionGates.nearest per tree occurrence rather than keying shared context
only by BlockNode identity. Associate each traversal’s gate state with its
corresponding generated copy, so ungated and gated occurrences of the same node
retain independent restore classification and domIds mappings.
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| const gate = isConditionGated(node) ? node : inherited; | ||
| if (gate === node) enclosing.set(node, inherited); | ||
| current.set(node, gate); | ||
| if (gate !== undefined) nearest.set(node, gate); |
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When the same BlockNode object occurs in two slots under different gates—a shape the tree walkers deliberately treat as two placements—this identity-keyed map retains only one placement's nearest gate. For example, if a restored target occurs under gates A and B, its holder is under A, and an ungated namesake keeps the old ID, both target outcomes are attributed to B; the holder under A therefore follows the ungated namesake instead of its restored colocated target. Record the gate for each traversal occurrence rather than collapsing all occurrences of a node object into one nearest entry.
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Addressed in 2c090ff.
The example here (a holder under gate A whose restored target is also under A, next to an ungated namesake that keeps the old id) is now decided by the holder's own record: a reference whose holder has a record answer takes it, so the link is restored with its target whatever the gates around either are. The identity-keyed gate map this finding points at (conditionGates.nearest) is removed along with the rest of the gate-chain model.
Per-placement gating still matters for a reference with NO record, which follows its target. A node object placed under a gate in one slot and under none in another now counts as open (prunedInEveryPlacement, from one walk placementGating that inherits each placement's gate from the path it was reached by), so it settles such a reference as a visible renderer.
Test: follows a target placed both open and gated as an open one. The own-record rule is covered by restores a gated link from its own answer beside a namesake that keeps its id and restores a link under nested gates from its own answer past a visible namesake.
Verified: 22 wrong implementations, each applied at exactly one site and type-clean, each failing at least one of the 315 tests in the three suites (unmodified control: 315/315 passing); every new or renamed test is failed by the implementations aimed at its rule. Gates at this commit: pnpm check-types (44/44), blocks-engine lint (0 warnings), check:comments, fallow audit (pass, 0 introduced), engine suite 2593/2593.
| ): string | undefined { | ||
| const byGate = each.outcomes.get(value); | ||
| if (byGate === undefined) return undefined; | ||
| const alongside = outcomesBehind(byGate, gatesOver(each.gates, holder)); |
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When a link and its restored target are under separate sibling gate nodes with identical conditions, they always render together, but this lookup considers only the holder's ancestor gate identities. If an ungated namesake retains the old ID, its outcome is therefore treated as the sole relevant target and overrides the link's restoration, leaving the link on the namesake while its intended target moves to the restored ID. Include gates whose conditions guarantee they open with the holder, not only the holder's ancestor chain.
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The case described here (a link governed by the same rename record as its target, in a sibling gate with equal conditions, next to an ungated namesake) is fixed in 2c090ff, though not by comparing gates. A reference whose holder has an answer from its own rename record now takes that answer, so the link is restored with its target and the namesake does not decide it.
Comparing gate conditions was the approach this change moves away from. Two gates can have conditions equal in meaning but written differently, and nothing in the document decides that, so a "renders together" model can only handle the spellings it knows. For a reference with no record, which still follows its target, the rule is visible renderers first, then gated ones. That is a best effort and does not model equal sibling gates. Stating that plainly rather than claiming it is handled.
Tests: restores a gated link from its own answer beside a namesake that keeps its id, restores a link inside a gated subtree from its own answer past a visible namesake, and the planner case restores a governed link from its own record past a namesake that keeps its id.
Verified: 22 wrong implementations, each applied at exactly one site and type-clean, each failing at least one of the 315 tests in the three suites (unmodified control: 315/315 passing); every new or renamed test is failed by the implementations aimed at its rule. Gates at this commit: pnpm check-types (44/44), blocks-engine lint (0 warnings), check:comments, fallow audit (pass, 0 introduced), engine suite 2593/2593.
Settling a reference by the element it points at meant deciding which elements render together, and each review round found another case: nested gates, one node placed under two gates, sibling gates with equal conditions. A reference's holder knows where it pointed, so its answer now decides; only a reference with no answer follows its target, visible renderers first. The gate-chain reading is removed. A node placed both open and gated counts as open when an unrelated reference follows it, from one walk that also still gives hiddenSubtreeNodes its any-placement-pruned answer.
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| const visible = each.outcomes.get(value); | ||
| if (visible !== undefined) return soleOutcome(visible); |
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When a reference has no own restoration answer, its holder and restored target are inside the same gated subtree, and an unrelated ungated node carries the current ID, this unconditional visible preference keeps the reference on the ungated namesake while the gated target moves. The final own-answer branch does not fix this case because an independently-originated holder returns undefined; fresh evidence is that settledTarget no longer receives the holder or its gate at all. Once that condition opens, the stored reference resolves to the unrelated element, so unanswered references must consider targets that necessarily render with their holder before preferring every ungated target.
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Reproduced at 2c090ff, and left as is deliberately.
Measured with the existing gated-subtree fixture (a visible unrelated node and a gated target both rendering shared-1, a link inside the same gate): when the link's holder has its own answer, it is restored to shared (control); when it has none and only the target does, the target moves to shared and the link stays on shared-1, the visible node. That is the case described here.
It is the specified rule rather than an oversight. A reference whose holder has a record answer takes it; one with no answer follows the element it points at, with renderers the page always shows settling it before gated ones. Settling an unanswered reference by "targets that necessarily render with the holder" is the model this change removes: modelling it needs gate identity per placement, sibling gates whose conditions agree, and conditions equal in meaning but written differently, which the document cannot decide. The previous two rounds each found a new edge of exactly that question.
What the rule gives up is stated in the PR body: an unanswered link inside a gate, next to a visible namesake, points at the element the page renders today. A link that belongs to the same pattern as its target has an answer and is restored with it (restores a link inside a gated subtree from its own answer past a visible namesake).
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Follow-up to #1871, which merged while this review finding was being worked.
What was wrong
Codex on #1871 (
tree.ts,restoreEachcopier): a saved forest holding avisible renamed target and a condition-gated namesake with the same current
id counted both as renderers. With the visible one restored to
sharedand thegated one keeping
shared-1, the id looked contested, so an unrelated referencefell to its holder and kept
shared-1— an id nothing renders once the rendererprunes the gated node.
Reproduced before the change by three tests, each asserting the link's value:
tree.reid-with-map— follows the visible target past a gated namesakeshared-1tree.reid-with-map— treats a node inside a gated subtree as gated (inherited)shared-1composition-planners— points an unrelated link at the visible renamed node past a gated namesake (throughplanSaveAsPattern)What this changes
nothing about the page.
hiddenSubtreeNodes, the renderer's ownpruning rule (inherited gating included), rather than a second reading of which
nodes are visible.
settledTarget, decides what a reference follows, anddomIdsreads the same function: visible renderers decide whenever any visible node
carries the id; gated renderers decide only where none does.
One deliberate difference from excluding gated nodes outright
Where no visible node carries the id, gated renderers still settle it. Excluding
them would hand a link whose only target is gated today to its holder; an
unrelated holder keeps the old id while the target restores, splitting the two the
moment the condition shows the target. The control "follows a gated target when
nothing visible carries the id" passes here and fails under a strict exclusion.
Evidence
branch: 2588 tests, all passing.
substitution, type-checked, the copier/planner/document suites run and the file
restored byte-for-byte. Every one fails at least one test; the four aimed at this
rule:
check-types,blocks-enginelint (0 warnings),check:comments,fallow audit(pass, 0 introduced), changeset check.Second review round (ce2c738)
Codex on this PR: letting visible renderers settle every reference handed a
reference inside a gated subtree to an unrelated visible namesake. With the
gated target restored beside it, the pattern's own link kept
shared-1and wouldpoint at the namesake once the gate opened.
Rule, unchanged in spirit — follow the target — with the target defined as what
renders whenever the reference does. A reference renders only when every gate
above it is open; then so does everything ungated and every node behind a gate
that is also over the reference. Those nodes settle it: agree → the reference
takes their id; disagree → its holder decides; none carries the id → every
carrier decides.
hiddenSubtreeNodesis now derived from a reading of which gatecovers each node, so pruning and gate membership come from one walk.
Not taken literally: "the holder decides for every reference inside a gate"
splits a gated link from the only node rendering with it (control: "keeps a gated
link on the one node that renders with it").
namesake; nested gates; the same through
planSaveAsPattern.test, including one per gate rule. check-types, lint, check:comments, fallow
(pass, 0 introduced).
Third review round (2c090ff)
CodeRabbit and Codex on ce2c738 found three more edges of the same question the
gate chain answered — which elements render together: one node object placed in
two slots under different gates (twice), and sibling gates whose conditions agree.
Conditions equal in meaning but written differently cannot be decided from the
document, so that model has no end.
Rule changed: a reference takes its own record's answer first. A reference
whose holder has an answer from its rename record takes it; only a reference with
no answer follows the element it points at, visible renderers before gated ones.
The gate-chain code (
conditionGates,gatesOver,outcomesBehind) is removed.Accepted consequence: a governed link saved without its target, or beside an
unrelated lookalike keeping the old id, stores the pattern's source name — as a
link saved alone already did.
Placement fix, for references with no record. A node object placed both open
and gated counts as open (
prunedInEveryPlacement, from one walkplacementGatingthat also giveshiddenSubtreeNodesits unchangedany-placement-pruned answer). Verified that
mapForestcopies such a node onceper placement.
holder's answer even when its target keeps its id", "restores a gated link from
its own answer beside a namesake that keeps its id", planner "restores a governed
link from its own record past a namesake that keeps its id". Round-2 tests kept
and renamed to the own-record reasoning.
failing at least one test (control 315/315). Seven aim at this round — target
before the holder's answer, holder's answer ignored, any-placement-pruned used as
hidden, open placements not subtracted, gating not inherited, gated preferred over
visible, gated and visible treated alike — plus 15 re-run per-node and planner
rules. Every new or renamed test is failed by the ones aimed at it.
check-types(44/44), blocks-engine lint (0 warnings),check:comments,fallow audit(pass, 0 introduced), engine suite 2593/2593.Summary by CodeRabbit