fix: preserve a live resize when serializing missing-node placeholders - #15713
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mattmillerai wants to merge 3 commits into
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fix: preserve a live resize when serializing missing-node placeholders#15713mattmillerai wants to merge 3 commits into
mattmillerai wants to merge 3 commits into
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The placeholder branch in LGraphNode.serialize() replays last_serialization so a missing node's original data survives a save, and #6792 added pos and mode on top of it so a user could move or bypass the placeholder without losing the change. size was left out, so resizing a placeholder to read its error text was silently discarded on save while a move of the same node was kept. Carry size through the same way. Every placeholder creation site seeds the live size from the same data as last_serialization, so this is a no-op until the user actually resizes. Co-authored-by: Christian Byrne <cbyrne@comfy.org>
The fixture node has no type, so it loads as a placeholder whose last_serialization carries neither pos nor size. pos was already synthesised from the live node into the snapshot; size now is too.
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🎭 Playwright: ✅ 1985 passed, 0 failed📊 Browser Reports
🎨 Storybook: ✅ Built — View Storybook📦 Bundle: 9.11 MB gzip 🟢 -93 BDetailsSummary
Category Glance App Entry Points — 3.71 kB (baseline 3.71 kB) • ⚪ 0 BMain entry bundles and manifests
Status: 1 added / 1 removed Graph Workspace — 1.38 MB (baseline 1.38 MB) • ⚪ 0 BGraph editor runtime, canvas, workflow orchestration
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Status: 66 added / 66 removed / 219 unchanged ⚡ Performance Report
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📝 WalkthroughWalkthroughThe error serialization path now preserves the current node size with mode and position. Tests verify that missing-node placeholders retain live geometry and replay serialized fields. ChangesMissing-node serialization
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The serialization fix is localized and preserves resized placeholder dimensions, but the regression test sets the size directly rather than using the normal resize flow, so coverage of the user action is incomplete. The PR is mergeable with owner awareness or a follow-up test for the production resize path. Suggested reviewers: Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 inconclusive)
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Inline comments:
In `@src/lib/litegraph/src/LGraphNode.test.ts`:
- Around line 120-121: Update the test around the placeholder geometry
assertions to resize the placeholder through the same production store or
command used for user resizing, rather than assigning placeholder.pos and
placeholder.size directly; preserve the expected geometry values and document
the exception only if placeholders have no production mutation path.
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🔍 Cursor Review — Consolidated panel
Triggered by @mattmillerai.
Found 5 finding(s).
| Severity | Count |
|---|---|
| 🟡 Medium | 2 |
| 🟢 Low | 3 |
Panel: 8/8 reviewers contributed findings.
Codecov Report✅ All modified and coverable lines are covered by tests. @@ Coverage Diff @@
## main #15713 +/- ##
==========================================
+ Coverage 79.42% 81.90% +2.47%
==========================================
Files 2218 1888 -330
Lines 112288 107284 -5004
Branches 31273 29617 -1656
==========================================
- Hits 89185 87869 -1316
+ Misses 22624 19077 -3547
+ Partials 479 338 -141
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... and 338 files with indirect coverage changes 🚀 New features to boost your workflow:
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…recorded size Guard the new `size` passthrough on two cases review surfaced: - `last_serialization` with no `size` (schema v0.4 / partial entries): the unconditional override wrote the LGraphNode constructor default [140, 60] into the saved workflow, a dimension the source file never had, pinning the real node to it once the pack is installed. Reverts the v0.4 snapshot churn along with it. - Collapsed placeholders: Vue nodes mode clears the CSS width/height floors on collapse, so the ResizeObserver -> layoutStore -> useLayoutSync chain writes the collapsed card's measurement back to `node.size`. Since `flags` is still replayed from the file, persisting that would pair `collapsed: false` with collapsed dimensions. Tests now drive geometry through `setPos`/`setSize` (the production mutators `LGraphCanvas` resizing uses) rather than raw field assignment.
dosubot
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added
size:S
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@coderabbitai review All review threads on this PR are addressed and resolved as of b6b3870, and CI is green (69 pass / 25 skipped / 0 fail). Summary of what changed since your review:
The |
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🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
echo '--- Current PR diff summary ---'
git diff --stat HEAD^ HEAD || true
git diff -- src/lib/litegraph/src/LGraphNode.ts src/lib/litegraph/src/LGraphNode.test.ts
echo '--- Source file outline ---'
ast-grep outline src/lib/litegraph/src/LGraphNode.ts --items all --match 'serialize|LGraphNode' --view expanded || true
echo '--- Test file outline ---'
ast-grep outline src/lib/litegraph/src/LGraphNode.test.ts --items all --match 'serialize|missing|placeholder' --view expanded || true
echo '--- Serialization and placeholder test references ---'
rg -n -C 8 --glob 'LGraphNode.ts' --glob 'LGraphNode.test.ts' \
'(last_serialization|serialize\s*\(|setPos\s*\(|setSize\s*\(|placeholder|collapsed)' \
src/lib/litegraph/srcLength of output: 64094
The implementation uses ✏️ Learnings added
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mattmillerai
dismissed
coderabbitai[bot]’s stale review
August 23, 2026 08:10
Superseded by b6b3870. CodeRabbit re-reviewed at 08:01Z and reported "Review complete. I found no remaining issues", but is rate-limited from updating this review's formal state, so the stale CHANGES_REQUESTED was the only remaining merge blocker. Its inline finding is fixed (tests now use setPos/setSize) and all six review threads are resolved. CI green: 69 pass / 25 skipped / 0 fail. Human merge approval still required.
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🤖 The reviews loop filed Linear follow-up ticket(s) for review thread(s) deferred as out of scope for this PR:
The following carry
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This was referenced Aug 23, 2026
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ELI-5
If you open a workflow that uses a node pack you don't have installed, ComfyUI draws a grey placeholder box in its place and remembers everything the file said about the real node, so nothing is lost when you eventually install the pack. You're allowed to nudge that box out of the way or bypass it, and those changes are kept when you save. But if you drag its corner to make it bigger — usually so you can actually read the error text inside it — that resize was thrown away the moment you saved. This makes the resize stick, exactly the same way the move already does.
Summary
LGraphNode.serialize()has a special case for missing-node placeholders that replayslast_serializationand overridesmodeandposfrom the live node.sizewas computed on the live node and then discarded, so a user's resize of a placeholder was silently lost on save while a move of the same node was kept. This carriessizethrough the same way, scoped to the cases where the live size is genuinely the user's.Changes
serialize()'s placeholder branch now returnssizefrom the live node alongsideposandmode, guarded on the placeholder being expanded and its recorded serialization already having a size (see Review Focus for why both). Adds regression tests inLGraphNode.test.ts.sizeon placeholder entries that previously had one recorded; every reader ofISerialisedNodealready treatssizeas required. No snapshot changes — this PR alters no serialization output except the user's actual resize.Why
posandmodebut notsize— the historyThe pass-through list is not arbitrary and it is not a deliberate exclusion of
size. It comes from #6792 ("Allow updating position and mode on missing nodes",bdf6d4dea2), which changedreturn this.last_serializationintoreturn { ...this.last_serialization, mode: o.mode, pos: o.pos }with the rationale: "even small and safe changes (like moving the node out of the way or bypassing it so the workflow can be run) will be discarded on reload." Moving and bypassing were the two actions that author had in hand; resizing is the same class of small, safe, user-initiated change and was simply not covered. Nothing in that commit, its description, or the surrounding code argues for keeping the file'ssizeover the user's.Review Focus
The risky line is
size: o.size, and it is only safe under two conditions — both of which review surfaced and both of which are now guarded.A placeholder's live
sizeis never stale relative tolast_serialization. All three sites that create a placeholder keep the two in sync at creation:LGraph.ts:2626(workflow load) andLGraph.ts:2007(subgraph unpack) both callnode.configure(n_info)with the same object they assigned tolast_serialization, andconfigure()copiesinfo.sizeintothis.size;app.ts:2195(API-JSON import) buildslast_serialization.sizefromnode.size. So until the user actually resizes,o.sizedeep-equalslast_serialization.sizeand the write is a no-op.Guard 1 — the recorded serialization must have had a size. Schema v0.4 and partial node entries can omit
sizeentirely. There the live size is theLGraphNodeconstructor default[140, 60], not anything the file said, and a placeholder has no node definition to compute a real size from. Writing it would invent a dimension the source file never had and pin the real node to[140, 60]once the pack is installed — instead of letting it compute its natural size. Guarding onlast_serialization.size != nullalso means theLGraph.test.ts.snapv0.4 fixture is unchanged by this PR.Guard 2 — the placeholder must be expanded. In Vue nodes mode the node card's sizing is a floor, not an exact fit (
min-h-(--node-height)on the measured root,w-(--node-width)on the inner wrapper), so an expanded placeholder cannot measure smaller than its recorded size. Collapsing removes both floors:LGraphNode.vue'sisCollapsedwatcher parks--node-width/--node-heightinto-x-suffixed variables and clears the originals. The ResizeObserver then measures the collapsed card anduseLayoutSync.ts:55assignsliteNode.size = [layout.size.width, layout.size.height]— nothing in that pipeline filters collapsed nodes. Sinceflagsis still replayed from the file, an unguarded passthrough would paircollapsed: falsewith collapsed dimensions. The guard costs no capability: resizing while collapsed is already blocked upstream byuseNodeResize'sisCollapsedearly-return. In canvas mode collapsing never touches_sizeat all (renderingSizeis the separate getter), so the guard is a no-op there.Node replacement was already consistent with the new behaviour.
useNodeReplacement.ts:165-166sets the replacement node's geometry fromnode.pos/node.size— the live values, notlast_serialization— so swapping a placeholder for a newly-installed node already honoured a resize.serialize()was the odd one out.Not fixed — the rest of the placeholder branch
ISerialisedNodehas 18 fields. After this change 3 come from the live node (pos,size,mode) and 15 are still replayed fromlast_serialization. For most of them that is correct and deliberate: a placeholder has no node definition, sotype,inputs,outputs,properties,widgets_valuesand friends can only come from the file.Four of the 15 are not in that category, and I measured them rather than assuming: with a placeholder whose live
title,flags.collapsed,colorandbgcolorwere all changed,serialize()returns the file'stitleandflagsand dropscolor/bgcolorentirely. Those are user-set decorations, not things regenerated from a definition, so they are arguably the same defect as the one fixed here. They are deliberately left alone: whether a placeholder's rename or collapse should survive a save is a product call, not a mechanical one, and bundling it here would put a contested change in a PR whose point is a proven one-liner. That is why this PR saysRefsrather thanCloses—serialize()'s placeholder branch still drops user-visible state, so the issue should stay open until someone decides on those four. Tracked as a follow-up.Also untouched, and separately tracked: the
widgets_valuesindex asymmetry (#15669), and whether placeholders should be resizable at all (they are —resizableis undefined by default andLGraphCanvas.ts:8624gates on!== false).Refs #15628
Provenance
vitest run src/lib/litegraph/ src/platform/nodeReplacement/— 77 files, 1173 passed.vue-tsc --noEmit— clean;pnpm knip— clean;pnpm lint(oxlint main + audit) — 0 errors;pnpm format— no changes to the touched files. Mutation check on the guards: forcingcarriesLiveSize = truefails exactly the three assertions that should catch it —does not invent a size when the recorded serialization has none(expected { … } to not have property "size"),keeps the recorded size while collapsed, since flags are replayed from the file(expected [ 80, 30 ] to deeply equal [ 140, 60 ]), and the v0.4oldSchemaGraphsnapshot. Earlier mutation check on the base fix still holds: revertingsize: o.sizefailsexpect(serialized.size).toEqual([777, 666])with theposassertion above it still passing.pnpm test:unitwas not re-run for this revision; the previously observed 12 failures inscripts/cicd/check-binary-size.test.tsare a macOS-only artefact (the script's awk is written for GNU awk and BSD awk rejects it, so it exits 2 for every case), unrelated to this diff and unaffected on Linux CI.