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## Summary of the Pull Request This PR improves Dock band refresh and partially eliminates our favorite leak: - Reuses Dock item view models while their source items remain stable. - Coalesces bursty ItemsChanged notifications into a single follow-up refresh. - Cleans replaced and discarded view models after applying UI updates. - Prevents queued refreshes from repopulating bands after cleanup. - Handles unavailable UI schedulers without abandoning created view models. - Adds unit tests for reuse and cleanup. ## Pictures? Pictures! Before <img width="1671" height="400" alt="image" src="https://github.com/user-attachments/assets/3a0874e6-eded-44f0-8bc2-bfa223e2888d" /> After <img width="1671" height="716" alt="image" src="https://github.com/user-attachments/assets/1560bfdb-5701-40bd-9f20-d4e885159ab8" /> <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist - [x] Closes: #49428 <!-- - [ ] Closes: #yyy (add separate lines for additional resolved issues) --> - [ ] **Communication:** I've discussed this with core contributors already. If the work hasn't been agreed, this work might be rejected - [ ] **Tests:** Added/updated and all pass - [ ] **Localization:** All end-user-facing strings can be localized - [ ] **Dev docs:** Added/updated - [ ] **New binaries:** Added on the required places - [ ] [JSON for signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json) for new binaries - [ ] [WXS for installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs) for new binaries and localization folder - [ ] [YML for CI pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml) for new test projects - [ ] [YML for signed pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml) - [ ] **Documentation updated:** If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys) and link it here: #xxx <!-- Provide a more detailed description of the PR, other things fixed, or any additional comments/features here --> ## Detailed Description of the Pull Request / Additional comments <!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well --> ## Validation Steps Performed