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## Summary of the Pull Request This PR introduces a rough hotfix for several indexer-related issues. - Premise: patch what we can in-place and fix the core later (reworking `SeachEngine` and `SearchQuery` is slightly trickier). This patch also removes some dead code for future refactor. - Adds search cancellation to the File Search page and the indexer fallback. - Prevents older searches from overwriting newer model state and reduces wasted work. - Stops reusing the search engine; creates a new instance per search to avoid synchronization issues. - That `SeachEngine` and `SearchQuery` are not multi-threading friendly. - Removes search priming to simplify the code and improve performance. - Since `SearchQuery` cancels and re-primes on every search, priming provides little benefit and can hide extra work (for example, cancellation triggering re-priming). - Fixes the indexer fallback subject line not updating when there is more than one match. - It previously kept the old value, which was confusing. - ~Shows the number of matched files in the fallback result.~ - Fetching total number of rows was reverted, performance was not stable :( - Optimizes the indexer fallback by reducing the number of items processed but not used. - Only fetches the item(s) needed for the fallback itself—no extra work on the hot path. - Stops reusing the fallback result when navigating to the File Search page to show more results. This requires querying again, but it simplifies the flow and keeps components isolated. - Fixes the English mnemonic keyword `kind` being hardcoded in the search page filter. Windows Search uses localized mnemonic keyword names, so this PR replaces it with canonical keyword `System.Kind` that is universaly recognized. - Adds extra diagnostics to `SearchQuery` and makes logging more precise. - DataPackage for the IndexerListItem now defers including of storage items - boost performance and we avoid touching the item until its needed. - IndexerPage with a prepopulated query will delay loading until the items are actually enumerated (to avoid populating from fallback hot path) and it no longer takes external SearchEngine. It just recreates everything. <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist - [x] Related to: #44728 - [x] Closes: #44731 - [x] Closes: #44732 - [x] Closes: #44743 <!-- - [ ] 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