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https://github.com/Comfy-Org/ComfyUI_frontend.git
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fix: subgraph unpacking creates extra link to seed widget (#9046)
## Summary Fix subgraph unpacking creating spurious links to widget inputs (e.g. seed) when the subgraph contains ComfySwitchNode with duplicate internal links. ## Changes - **What**: Two fixes in `_unpackSubgraphImpl`: 1. Strip links from serialized node data **before** `configure()` so `onConnectionsChange` doesn't resolve subgraph-internal link IDs against the parent graph's link map (which may contain unrelated links with colliding numeric IDs). 2. Deduplicate links by `(origin, origin_slot, target, target_slot)` before reconnecting, preventing repeated disconnect/reconnect cycles on widget inputs that cause slot index drift. ## Review Focus - The link-stripping before `configure()` mirrors what `LGraphNode.clone()` already does — nodes should be configured without stale link references when links will be recreated separately. - Deduplication is defensive against malformed subgraph data; the duplicate links in the reproduction workflow likely originated from a prior serialization bug. ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-9046-fix-subgraph-unpacking-creates-extra-link-to-seed-widget-30e6d73d36508125a5fefa1309485516) by [Unito](https://www.unito.io)
This commit is contained in:
Christian Byrne
183
browser_tests/assets/subgraphs/subgraph-duplicate-links.json
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183
browser_tests/assets/subgraphs/subgraph-duplicate-links.json
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{
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"id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
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"revision": 0,
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"last_node_id": 2,
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"last_link_id": 0,
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"nodes": [
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{
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"id": 2,
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"type": "e5fb1765-aaaa-bbbb-cccc-ddddeeee0001",
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"pos": [600, 400],
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"size": [200, 100],
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"flags": {},
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"order": 0,
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"mode": 0,
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"inputs": [],
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"outputs": [
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{
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"name": "LATENT",
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"type": "LATENT",
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"links": null
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}
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],
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"properties": {},
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"widgets_values": []
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}
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],
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"links": [],
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"groups": [],
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"definitions": {
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"subgraphs": [
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{
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"id": "e5fb1765-aaaa-bbbb-cccc-ddddeeee0001",
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"version": 1,
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"state": {
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"lastGroupId": 0,
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"lastNodeId": 2,
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"lastLinkId": 5,
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"lastRerouteId": 0
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},
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"revision": 0,
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"config": {},
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"name": "Subgraph With Duplicate Links",
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"inputNode": {
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"id": -10,
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"bounding": [200, 400, 120, 60]
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},
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"outputNode": {
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"id": -20,
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"bounding": [900, 400, 120, 60]
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},
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"inputs": [],
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"outputs": [
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{
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"id": "out-latent-1",
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"name": "LATENT",
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"type": "LATENT",
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"linkIds": [2],
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"pos": [920, 420]
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}
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],
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"widgets": [],
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"nodes": [
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{
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"id": 1,
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"type": "KSampler",
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"pos": [400, 100],
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"size": [270, 262],
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"flags": {},
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"order": 1,
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"mode": 0,
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"inputs": [
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{
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"name": "model",
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"type": "MODEL",
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"link": null
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},
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{
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"name": "positive",
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"type": "CONDITIONING",
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"link": null
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},
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{
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"name": "negative",
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"type": "CONDITIONING",
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"link": null
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},
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{
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"name": "latent_image",
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"type": "LATENT",
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"link": 1
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}
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],
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"outputs": [
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{
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"name": "LATENT",
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"type": "LATENT",
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"links": [2]
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}
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],
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"properties": {
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"Node name for S&R": "KSampler"
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},
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"widgets_values": [0, "randomize", 20, 8, "euler", "simple", 1]
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},
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{
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"id": 2,
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"type": "EmptyLatentImage",
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"pos": [100, 200],
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"size": [200, 106],
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"flags": {},
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"order": 0,
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"mode": 0,
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"inputs": [],
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"outputs": [
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{
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"name": "LATENT",
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"type": "LATENT",
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"links": [1, 3, 4, 5]
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}
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],
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"properties": {
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"Node name for S&R": "EmptyLatentImage"
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},
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"widgets_values": [512, 512, 1]
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}
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],
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"groups": [],
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"links": [
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{
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"id": 1,
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"origin_id": 2,
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"origin_slot": 0,
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"target_id": 1,
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"target_slot": 3,
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"type": "LATENT"
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},
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{
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"id": 2,
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"origin_id": 1,
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"origin_slot": 0,
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"target_id": -20,
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"target_slot": 0,
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"type": "LATENT"
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},
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{
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"id": 3,
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"origin_id": 2,
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"origin_slot": 0,
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"target_id": 1,
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"target_slot": 3,
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"type": "LATENT"
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},
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{
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"id": 4,
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"origin_id": 2,
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"origin_slot": 0,
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"target_id": 1,
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"target_slot": 3,
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"type": "LATENT"
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},
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{
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"id": 5,
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"origin_id": 2,
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"origin_slot": 0,
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"target_id": 1,
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"target_slot": 3,
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"type": "LATENT"
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}
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],
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"extra": {}
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}
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]
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},
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"config": {},
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"extra": {
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"ds": {
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"scale": 1,
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"offset": [0, 0]
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},
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"frontendVersion": "1.38.14"
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},
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"version": 0.4
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}
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@@ -375,6 +375,45 @@ test.describe('Subgraph Operations', { tag: ['@slow', '@subgraph'] }, () => {
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})
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})
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test.describe('Subgraph Unpacking', () => {
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test('Unpacking subgraph with duplicate links does not create extra links', async ({
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comfyPage
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}) => {
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await comfyPage.workflow.loadWorkflow(
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'subgraphs/subgraph-duplicate-links'
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)
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const result = await comfyPage.page.evaluate(() => {
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const graph = window.app!.graph!
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const subgraphNode = graph.nodes.find((n) => n.isSubgraphNode())
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if (!subgraphNode || !subgraphNode.isSubgraphNode()) {
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return { error: 'No subgraph node found' }
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}
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graph.unpackSubgraph(subgraphNode)
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const linkCount = graph.links.size
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const nodes = graph.nodes
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const ksampler = nodes.find((n) => n.type === 'KSampler')
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if (!ksampler) return { error: 'No KSampler found after unpack' }
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const linkedInputCount = ksampler.inputs.filter(
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(i) => i.link != null
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).length
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return { linkCount, linkedInputCount, nodeCount: nodes.length }
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})
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expect(result).not.toHaveProperty('error')
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// Should have exactly 1 link (EmptyLatentImage→KSampler)
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// not 4 (with 3 duplicates). The KSampler→output link is dropped
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// because the subgraph output has no downstream connection.
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expect(result.linkCount).toBe(1)
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// KSampler should have exactly 1 linked input (latent_image)
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expect(result.linkedInputCount).toBe(1)
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})
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})
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test.describe('Subgraph Creation and Deletion', () => {
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test('Can create subgraph from selected nodes', async ({ comfyPage }) => {
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await comfyPage.workflow.loadWorkflow('default')
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