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The expansion panel, tree and stepper removed their collapsed content only on the next render, after the animation player was reset or destroyed. The content was then painted in place for a frame, e.g. in zoneless applications. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
teodosiah
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❌ status: awaiting-test
viktorkombov
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💥 status: in-test
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🔵 Needs a closer look
Mocked/no-op tests do not validate the zoneless browser paint-timing fix under real animations, including rapid reversal and synchronous teardown or reentrant completion across carousel, tabs, and stepper.
No open issues 🎉
What changed in this PR
Fixes collapse flicker in zoneless Angular applications by updating rendered content before shared animation cleanup removes animation styles, addressing #17964.
Changes:
- Runs synchronous change detection before toggle-player reset and carousel leave-player destruction.
- Adds regression tests for expansion panels, tree nodes, and both stepper orientations, plus toggle completion ordering.
- Documents the user-visible fixes in the changelog.
| File | Description |
|---|---|
projects/igniteui-angular/tree/src/tree/tree.spec.ts |
Verifies child nodes are removed before collapse-player reset. |
projects/igniteui-angular/stepper/src/stepper/stepper.component.spec.ts |
Verifies content removal before animation cleanup in both orientations. |
projects/igniteui-angular/expansion-panel/src/expansion-panel/toggle-animation-component.ts |
Updates the owner view synchronously before close-player reset. |
projects/igniteui-angular/expansion-panel/src/expansion-panel/toggle-animation-component.spec.ts |
Tests change-detection ordering and post-destruction behavior. |
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 |
Moves leave completion and view updates ahead of player destruction. |
CHANGELOG.md |
Records expansion-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)