5eeb979339
## Summary of the Pull Request Closes #49899 Fixes a PowerToys Settings crash when navigating away from the Screen Ruler page with legacy measurement-unit settings. Older Screen Ruler builds persisted `Measurement::Unit` enum values (`Pixel = 1`, `Inch = 2`, `Centimetre = 4`, `Millimetre = 8`). The current Settings page binds the persisted value directly to a four-item `ComboBox.SelectedIndex`, which only accepts `0-3`. A persisted value such as `4` therefore produces a WinUI `E_INVALIDARG` stowed exception when the page is unloaded. `MeasureToolViewModel` now migrates legacy values to the current indices, validates all values before exposing them to XAML, and persists the repaired setting: - `4` (legacy centimetres) → `2` - `8` (legacy millimetres) → `3` - other out-of-range values → `0` (pixels) ## PR Checklist - [x] Closes: #49899 - [x] **Tests:** Added/updated and all pass - [x] **Localization:** N/A - no user-facing strings changed ## Detailed Description of the Pull Request / Additional comments The failure was reproduced on `main` with `%LOCALAPPDATA%\Microsoft\PowerToys\Measure Tool\settings.json` containing: ```json "UnitsOfMeasure": { "value": 4 } ``` Screen Ruler opened successfully, but navigating to Shortcut Guide terminated `PowerToys.Settings.exe` in `Microsoft.UI.Xaml.dll` with exception `0xc000027b` and `E_INVALIDARG` (`0x80070057`). Changing the persisted value to `0` eliminated the crash, confirming the invalid `SelectedIndex` as the cause. The migration preserves the intended legacy centimetre/millimetre selection rather than resetting it unnecessarily. ## Validation Steps Performed - Built `PowerToys.Settings.csproj` in ARM64 Release. - Added six Measure Tool ViewModel regression cases covering valid, invalid, and legacy values. - Ran the full Settings unit suite: **222 passed, 0 failed**. - Reproduced the original UI flow with `UnitsOfMeasure = 4`: - opened Screen Ruler; - verified the setting migrated to `2`; - navigated to Shortcut Guide; - repeated Screen Ruler → Shortcut Guide navigation; - verified the Settings process remained alive after both transitions. Copilot-Session: ebcedcc4-a067-4657-a6a9-046753f9d70c
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 30 utilities to help you customize and optimize your Windows experience:
Advanced Paste
Always on Top
Awake
Color Picker
Command Not Found
Command Palette
Crop And Lock
Environment Variables
FancyZones
File Explorer Add-ons
File Locksmith
Grab And Move
Hosts File Editor
Image Resizer
Keyboard Manager
Light Switch
Mouse Utilities
Mouse Without Borders
New+
Peek
PowerDisplay
PowerRename
PowerToys Run
Quick Accent
Registry Preview
Screen Ruler
Shortcut Guide
Text Extractor
Workspaces
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 the .exe file from GitHub
Go to the PowerToys GitHub releases, scroll down and select Assets to reveal the installation files, and choose the one that matches your architecture and install scope. For most devices, that would be x64 per-user.
Microsoft Store
You can easily install PowerToys from the Microsoft Store:
WinGet
Download PowerToys from [WinGet](https://github.com/microsoft/winget-cli#installing-the-client). 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](https://learn.microsoft.com/windows/powertoys/install#community-driven-install-tools) such as Chocolatey and Scoop. If these are your preferred install solutions, you can find the install instructions there.
✨ What's new?
To see what's new, check out the release notes.
🛣️ Roadmap
We are planning some nice new features and improvements for the next releases – a brand-new Shortcut Guide experience, ensuring it's easier to find and install Command Palette extensions and so much more! Stay tuned for v0.100!
❤️ 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.