Jiří Polášek c34fb7f953 CmdPal: Harden ListViewModel fetch synchronization (#46429)
## Summary of the Pull Request

This PR improves fetching of list items in ListViewModel:
- Fixes _vmCache concurrency with copy-on-write cache publication.
- Preserves latest-fetch-wins behavior across overlapping RPC GetItems()
calls.
- Prevents stale or canceled fetches from publishing and makes them
abort promptly.
- Improves cancellation cleanup for abandoned item view models and
replaced token sources.
- Updates empty-state tracking to follow overlapping fetch activity
correctly.
- Reduces hot-path cache overhead by removing per-item cache locking and
full cache rebuilds.
- Adds guard against re-entry, to prevent situations like #46329:
- Defers ItemsChanged-triggered fetches raised during GetItems() until
the call unwinds;
- Uses a thread-local reentry guard so unrelated cross-thread fetches
are not delayed;
- Adds a regression test covering recursive GetItems() refresh behavior.
- Make sure we never invoke FetchItems on UI thread, and be loud in
debug when we are.

<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist

- [x] Closes: #46331
<!-- - [ ] 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
2026-03-30 21:27:08 -05:00
2026-02-11 22:59:53 +01:00
2022-07-19 13:06:16 -07:00
2020-03-05 10:11:27 -08:00
2020-05-02 15:59:18 -07:00
2026-02-14 15:47:56 +08:00
2026-02-14 15:47:56 +08:00

Microsoft PowerToys

Microsoft PowerToys is a collection of utilities that help you customize Windows and streamline everyday tasks.

Installation · Documentation · Blog · Release notes



🔨 Utilities

PowerToys includes over 25 utilities to help you customize and optimize your Windows experience:

Advanced Paste icon Advanced Paste Always on Top icon Always on Top Awake icon Awake
Color Picker icon Color Picker Command Not Found icon Command Not Found Command Palette icon Command Palette
Crop and Lock icon Crop And Lock Environment Variables icon Environment Variables FancyZones icon FancyZones
File Explorer Add-ons icon File Explorer Add-ons File Locksmith icon File Locksmith Hosts File Editor icon Hosts File Editor
Image Resizer icon Image Resizer Keyboard Manager icon Keyboard Manager Light Switch icon Light Switch
Mouse Utilities icon Mouse Utilities Mouse Without Borders icon Mouse Without Borders New+ icon New+
Peek icon Peek PowerRename icon PowerRename PowerToys Run icon PowerToys Run
Quick Accent icon Quick Accent Registry Preview icon Registry Preview Screen Ruler icon Screen Ruler
Shortcut Guide icon Shortcut Guide Text Extractor icon Text Extractor Workspaces icon Workspaces
ZoomIt icon ZoomIt

📋 Installation

For detailed installation instructions and system requirements, visit the installation docs.

But to get started quickly, choose one of the installation methods below:

Download .exe from GitHub
Go to the PowerToys GitHub releases, click Assets to reveal the downloads, and choose the installer that matches your architecture and install scope. For most devices, that's the x64 per-user installer.
Description Filename
Per user - x64 PowerToysUserSetup-0.98.1-x64.exe
Per user - ARM64 PowerToysUserSetup-0.98.1-arm64.exe
Machine wide - x64 PowerToysSetup-0.98.1-x64.exe
Machine wide - ARM64 PowerToysSetup-0.98.1-arm64.exe
Microsoft Store
You can easily install PowerToys from the Microsoft Store:

WinGet
Download PowerToys from WinGet. Updating PowerToys via winget will respect the current PowerToys installation scope. To install PowerToys, run the following command from the command line / PowerShell:

User scope installer [default]

winget install Microsoft.PowerToys -s winget

Machine-wide scope installer

winget install --scope machine Microsoft.PowerToys -s winget
Other methods
There are community driven install methods such as Chocolatey and Scoop. If these are your preferred install solutions, you can find the install instructions there.

What's new?

What's new image

To see what's new, check out the release notes.

🛣️ Roadmap

We are planning some nice new features and improvements for the next releases PowerDisplay, Command Palette improvements and a brand-new Shortcut Guide experience! Stay tuned for v0.99!

❤️ PowerToys Community

The PowerToys team is extremely grateful to have the support of an amazing active community. The work you do is incredibly important. PowerToys wouldn't be nearly what it is today without your help filing bugs, updating documentation, guiding the design, or writing features. We want to say thank you and take time to recognize your work. Your contributions and feedback improve PowerToys month after month!

Contributing

This project welcomes contributions of all types. Besides coding features / bug fixes, other ways to assist include spec writing, design, documentation, and finding bugs. We are excited to work with the power user community to build a set of tools for helping you get the most out of Windows. We ask that before you start work on a feature that you would like to contribute, please read our Contributor's Guide. We would be happy to work with you to figure out the best approach, provide guidance and mentorship throughout feature development, and help avoid any wasted or duplicate effort. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you grant us the rights to use your contribution and that you have permission to do so. For guidance on developing for PowerToys, please read the developer docs for a detailed breakdown. This includes how to setup your computer to compile.

Code of Conduct

This project has adopted the Microsoft Open Source Code of Conduct.

Privacy Statement

The application logs basic diagnostic data (telemetry). For more privacy information and what we collect, see our PowerToys Data and Privacy documentation.

Description
Microsoft PowerToys is a collection of utilities that help you customize Windows and streamline everyday tasks
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