Summary of the Pull Request

This PR passed foreground permission to extension every time a command is invoked. Because Windows can revoke the grant after input to another process.

• Grants CoAllowSetForegroundWindow to extension every time a command is invoked.


• Moves the grant into ExtensionWrapper.


• Avoids lifecycle-lock waits for repeated grants and update the active extension atomically.


• Replaces getter-count tests with grant-request coverage.

What I don't want to touch here:
- Check whether the extension is running only when switching to it, avoiding an extra COM call for repeated commands. Changing how failed checks are handled is outside this PR's scope.
- Run the command even if granting foreground permission fails.

PR Checklist

• [x] Closes: #50642


• [ ] Closes: #39255
  <!-- - [ ] 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 for new binaries
  
  
  • [ ] WXS for installer for new binaries and localization folder
  
  
  • [ ] YML for CI pipeline for new test projects
  
  
  • [ ] YML for signed pipeline
    
  
  
  
  


• [ ] Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed