fix: keep node preview images across workflow tab switches - #15360
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app.clean() runs on every workflow load and calls nodeOutputStore.resetAllOutputsAndPreviews(), which revokes every preview object URL and empties the preview maps. Unlike nodeOutputs, nothing puts them back, and a websocket preview frame cannot be re-fetched, so a finished run's last preview is lost permanently. Failing test documenting the loss.
Scope preview state per workflow instead of letting app.clean() destroy it. workflowService.beforeLoadNewGraph() now hands the live previews to nodeOutputStore, which holds them against the outgoing workflow path so app.clean() has nothing to revoke, and afterLoadNewGraph() puts back the previews belonging to the workflow that just became active. Keying by workflow path is what makes this safe to preserve: node locator ids for root-graph nodes are bare node ids, so a global map would show one workflow's preview on another workflow's same-id node. Clearing a workflow in place still revokes, previews that arrive for the incoming graph while it loads win over the stashed copy, and previews for workflows that have since been closed are released.
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🎨 Storybook: ✅ Built — View Storybook🎭 Playwright: ✅ 1820 passed, 0 failed · 3 flaky📊 Browser Reports
📦 Bundle: 8.85 MB gzip 🔴 +581 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 — 1.37 MB (baseline 1.37 MB) • ⚪ 0 BGraph editor runtime, canvas, workflow orchestration
Status: 2 added / 2 removed / 1 unchanged Views & Navigation — 124 kB (baseline 124 kB) • ⚪ 0 BTop-level views, pages, and routed surfaces
Status: 13 added / 13 removed / 4 unchanged Panels & Settings — 566 kB (baseline 566 kB) • ⚪ 0 BConfiguration panels, inspectors, and settings screens
Status: 10 added / 10 removed / 16 unchanged User & Accounts — 27.7 kB (baseline 27.7 kB) • ⚪ 0 BAuthentication, profile, and account management bundles
Status: 6 added / 6 removed / 5 unchanged Editors & Dialogs — 125 kB (baseline 125 kB) • ⚪ 0 BModals, dialogs, drawers, and in-app editors
Status: 7 added / 7 removed / 1 unchanged UI Components — 67.1 kB (baseline 67.1 kB) • ⚪ 0 BReusable component library chunks
Status: 6 added / 6 removed / 8 unchanged Data & Services — 3.52 MB (baseline 3.52 MB) • 🔴 +2.33 kBStores, services, APIs, and repositories
Status: 14 added / 14 removed / 3 unchanged Utilities & Hooks — 550 kB (baseline 550 kB) • ⚪ 0 BHelpers, composables, and utility bundles
Status: 18 added / 18 removed / 20 unchanged Vendor & Third-Party — 16.8 MB (baseline 16.8 MB) • ⚪ 0 BExternal libraries and shared vendor chunks Status: 18 unchanged Other — 14.2 MB (baseline 14.2 MB) • ⚪ 0 BBundles that do not match a named category
Status: 68 added / 68 removed / 217 unchanged ⚡ Performance Report
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Trend (last 15 commits on main)
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📝 WalkthroughWalkthroughThe node output store now preserves workflow preview URLs across workflow switches. The workflow service stashes previews before graph cleanup and restores them after activation. Tests cover restoration, isolation, cleanup, and object URL revocation. ChangesWorkflow preview lifecycle
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to This change preserves node previews when switching workflow tabs, but closing a workflow can leave its retained preview resources allocated until another workflow load, which may accumulate unnecessary memory use during a session. The close-path cleanup should be fixed or explicitly accepted before merge. Sequence Diagram(s)sequenceDiagram
participant WorkflowService
participant NodeOutputStore
participant GraphCleanup
WorkflowService->>NodeOutputStore: Stash active workflow previews
WorkflowService->>GraphCleanup: Clean up graph outputs
WorkflowService->>WorkflowService: Activate loaded workflow
WorkflowService->>NodeOutputStore: Restore loaded workflow previews
Possibly related PRs
Suggested reviewers: Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 inconclusive)
✅ Passed checks (6 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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Actionable comments posted: 2
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Inline comments:
In `@src/stores/nodeOutputStore.ts`:
- Around line 331-345: Expose an explicit action to discard stashed previews for
a workflow, then invoke it after workflowStore.closeWorkflow(workflow) succeeds
so closed workflows immediately revoke retained blob URLs. Add a test covering
closure without a subsequent workflow switch and verifying immediate revocation.
In `@src/stores/nodeOutputStore.workflowSwitch.test.ts`:
- Around line 96-163: The workflow-switch preview tests need coverage for
supersession and undo/redo behavior. Add a test where a new live preview arrives
during workflow loading, confirming it replaces the stashed preview and revokes
the superseded URL. Add an undo/redo workflow-switch test verifying each
workflow restores only its own preview and preserves valid object URLs,
alongside the existing restoration, isolation, clearing, and closing coverage.
Apply the same fix in
`@src/platform/workflow/core/services/workflowService.test.ts` around lines 320 -
334: Covers the lifecycle-hook portion of the consolidated behavioral test
request.
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src/platform/workflow/core/services/workflowService.test.tssrc/platform/workflow/core/services/workflowService.tssrc/scripts/app.test.tssrc/stores/nodeOutputStore.tssrc/stores/nodeOutputStore.workflowSwitch.test.ts
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Codecov Report✅ All modified and coverable lines are covered by tests. @@ Coverage Diff @@
## main #15360 +/- ##
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+ Coverage 79.20% 81.66% +2.45%
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Files 2209 1882 -327
Lines 115911 107515 -8396
Branches 34697 31917 -2780
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- Hits 91808 87797 -4011
+ Misses 23592 19349 -4243
+ Partials 511 369 -142
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... and 383 files with indirect coverage changes 🚀 New features to boost your workflow:
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Eviction only ran on the next workflow load, so closing the last tab left the closed workflow's preview blobs allocated for the rest of the session. workflowService.closeWorkflow() now discards them explicitly. Also covers the two lifecycle branches that had no test: a preview that arrives while the incoming graph loads supersedes the stashed one, and reloading the same workflow in place round-trips its previews.
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| flag | base | head |
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unit |
72.89% · 94,706 lines · 2 sessions | 72.91% · 94,744 lines · 1 session |
e2e |
67.82% · 77,093 lines · 45 sessions | 67.01% · 73,315 lines · 16 sessions |
The unit flag went up (+0.02%) and codecov/patch is 100% of diff hit. The entire drop sits in the e2e flag, where the head report has 16 upload sessions observing 73,315 lines against the base's 45 sessions observing 77,093. Fewer e2e sessions over the same source tree means fewer observed hits, which drags the combined unit+e2e project number down regardless of what the diff does. All CI workflows on this commit, including CI: Tests E2E, are green.
codecov.yml already documents this flag as unreliable: "uploaded by a separate workflow_run job that can fail or arrive after Codecov has already computed the patch status". carryforward covers a missing e2e upload but not a partial one, which is what happened here.
Control, from the other open PRs right now: project sits anywhere from 80.79% to 81.49% depending on base, and #15400 / #15401 both report -0.01% but pass on codecov's adjusted base. A -0.02% swing is inside that noise band.
No code change to make. Worth noting separately that the default project status has target: auto with no threshold, so any e2e upload jitter fails it; a small threshold there would stop this recurring, but that is a repo-config change and does not belong in this PR.
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@jtydhr88 assigning you because this lands in the same area as your #14941. This fixes preview loss on a workflow tab switch by scoping preview state to the workflow path inside Flagging the overlap so you have the context, not to reopen the design question here. |
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@coderabbitai full review Both threads from the previous review are resolved and confirmed addressed in 3fb0d4f. Requesting a fresh pass so the stale |
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🧠 Learnings used
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@coderabbitai review |
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christian-byrne
dismissed
coderabbitai[bot]’s stale review
August 18, 2026 21:21
Dismissing as stale. Both findings from this review were fixed in 3fb0d4f and CodeRabbit confirmed each one in-thread ("Confirmed as addressed" / "verified"); both threads are resolved. A fresh review cannot clear this state on its own: CodeRabbit is rate limited at the org level and, per its own reply, "does not re-review already reviewed commits". Dismissal removes the stale blocking state only. It is not an approval, and this PR still needs a human reviewer before merge.
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Aug 19, 2026
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verified locally, after switched tab:
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## Summary Node preview images are lost permanently on a workflow tab switch, because `app.clean()` revokes their object URLs and nothing restores them. This scopes preview state per workflow instead. Fixes FE-1645 ## Changes - **What**: `workflowService.beforeLoadNewGraph()` hands the live previews to `nodeOutputStore` keyed by the outgoing workflow path, so `app.clean()` has nothing left to revoke. `afterLoadNewGraph()` puts back the previews belonging to the workflow that just became active. ### Before 1. Open workflow A with a KSampler, preview method anything but `none`. 2. Queue it and let it finish — the KSampler shows its final latent preview. 3. Switch to tab B, switch back to tab A. 4. The preview is gone and never comes back. Output images on other nodes survive the same switch. `app.clean()` (`src/scripts/app.ts:2434`) runs on every workflow load and calls `resetAllOutputsAndPreviews()` → `revokeAllPreviews()` (`src/stores/nodeOutputStore.ts:301`), which releases every preview object URL and empties the maps. `nodeOutputs` survives only because `ChangeTracker` snapshots and restores it (`src/scripts/changeTracker.ts:306`/`350`); previews have no equivalent. Nothing revokes previews at execution end, so a finished run's last frame is real state a user is looking at — and a `b_preview` websocket frame cannot be re-fetched, so revoking makes the loss permanent. ### After The preview is still there when you come back to the tab. ## Review Focus - Keying by workflow path is load-bearing, not incidental. Node locator ids for root-graph nodes are bare node ids, so simply not clearing on load would show workflow A's node 5 preview on workflow B's node 5. - Ownership of the object URL retain moves from the live map to the stash and back, so nothing is released on a tab switch. Released instead when: the workflow is cleared in place (`Clear Workflow` still calls `app.clean()` with no load following it), the workflow has been closed, or a preview arriving for the incoming graph supersedes the stashed one. - Undo/redo goes through `loadGraphData(..., clean = false)` for the same workflow — it stashes and restores under the same path, so the net effect is unchanged. - Deliberately not done: no `ChangeTracker` snapshot/restore field for previews, and no use of the `workflowTransientState` mechanism proposed in #14941, so this does not prejudge that review. ## Tests `src/stores/nodeOutputStore.workflowSwitch.test.ts` covers the round trip, the same-node-id cross-workflow case, release on close, and clear-in-place. `workflowService.test.ts` covers the two lifecycle hooks.
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@christian-byrne Successfully backported to #15474 |
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@christian-byrne Successfully backported to #15475 |
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Summary
Node preview images are lost permanently on a workflow tab switch, because
app.clean()revokes their object URLs and nothing restores them. This scopes preview state per workflow instead.Fixes FE-1645
Changes
workflowService.beforeLoadNewGraph()hands the live previews tonodeOutputStorekeyed by the outgoing workflow path, soapp.clean()has nothing left to revoke.afterLoadNewGraph()puts back the previews belonging to the workflow that just became active.Before
none.app.clean()(src/scripts/app.ts:2434) runs on every workflow load and callsresetAllOutputsAndPreviews()→revokeAllPreviews()(src/stores/nodeOutputStore.ts:301), which releases every preview object URL and empties the maps.nodeOutputssurvives only becauseChangeTrackersnapshots and restores it (src/scripts/changeTracker.ts:306/350); previews have no equivalent. Nothing revokes previews at execution end, so a finished run's last frame is real state a user is looking at — and ab_previewwebsocket frame cannot be re-fetched, so revoking makes the loss permanent.After
The preview is still there when you come back to the tab.
Review Focus
Clear Workflowstill callsapp.clean()with no load following it), the workflow has been closed, or a preview arriving for the incoming graph supersedes the stashed one.loadGraphData(..., clean = false)for the same workflow — it stashes and restores under the same path, so the net effect is unchanged.ChangeTrackersnapshot/restore field for previews, and no use of theworkflowTransientStatemechanism proposed in fix: layer editor UX and review follow-ups #14941, so this does not prejudge that review.Tests
src/stores/nodeOutputStore.workflowSwitch.test.tscovers the round trip, the same-node-id cross-workflow case, release on close, and clear-in-place.workflowService.test.tscovers the two lifecycle hooks.