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## Summary of the Pull Request This PR implements actual cache in IconCacheService and adds some fixes on top for free. The good - `IconCacheService` now caches decoded icons - Ensures that UI thread is not starved by loading icons by limiting number of threads that can load icons at any given time - `IconCacheService` decodes bitmaps directly to the required size to reduce memory usage - `IconBox` now reacts to theme, DPI scale, and size changes immediately - Introduced `AdaptiveCache` with time-based decay to improve icon reuse - Updated `IconCacheProvider` and `IconCacheService` to handle multiple icon sizes and scale-aware caching - Added priority-based decoding in `IconCacheService` for more responsive loading - Extended `IconPathConverter` to support target icon sizes - Switched hero images in `ShellPage` to use the jumbo icon cache - Made `MainWindow` title bar logic resilient to a null `XamlRoot` - Fixed Tag icon positioning - Removes custom `TypedEventHandlerExtensions` in favor of `CommunityToolkit.WinUI.Deferred`. The bad - Since IconData lacks a unique identity, when it includes a stream, it relies on simple reference equality, acknowledging that it might not be stable. We might cache some obsolete garbage because of this, but it is fast and better than nothing at all. Yet another task for the future me. <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist - [ ] Closes: - [ ] Closes: #38284 - [ ] Related to: #44407 - [ ] Related to: https://github.com/zadjii-msft/PowerToys/issues/333 - [ ] **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