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teodosiah
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❌ status: awaiting-test
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🔵 Needs a closer look
Real-animation browser validation in a zoneless app is still needed to confirm flicker removal and interrupted transitions across tabs and carousel, since no-op/mock tests verify cleanup ordering but not painting behavior.
No open issues 🎉
What changed in this PR
Addresses collapse flicker in zoneless Angular applications (#17964) by updating component views before shared animation players clear their styles.
Changes:
- Renders collapsed views synchronously before toggle-player reset and carousel leave-player destruction.
- Adds regression tests for content removal timing in expansion panels, tree nodes, and both stepper orientations.
- Documents the user-visible fixes in the changelog.
| File | Description |
|---|---|
projects/igniteui-angular/tree/src/tree/tree.spec.ts |
Verifies node children are removed before collapse-player reset. |
projects/igniteui-angular/stepper/src/stepper/stepper.component.spec.ts |
Verifies content removal timing for vertical and horizontal transitions. |
projects/igniteui-angular/expansion-panel/src/expansion-panel/toggle-animation-component.ts |
Adds optional synchronous change detection before close-player reset. |
projects/igniteui-angular/expansion-panel/src/expansion-panel/toggle-animation-component.spec.ts |
Tests close-completion ordering, open behavior, and destruction handling. |
projects/igniteui-angular/expansion-panel/src/expansion-panel/expansion-panel.spec.ts |
Verifies panel body removal before close-player reset. |
projects/igniteui-angular/carousel/src/carousel/carousel-base.ts |
Emits leave completion and refreshes the view before destroying the player. |
CHANGELOG.md |
Records the panel, stepper, and tree flicker fixes. |
Review effort: Balanced
mddragnev
approved these changes
Nov 13, 2026
1 of 23 tasks
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Closes #17964
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Checklist:
feature/README.MDupdates for the feature docsREADME.MDCHANGELOG.MDupdates for newly added functionalityng updatemigrations for the breaking changes (migrations guidelines)