chess 4caa5d615d
Keep Windows sandbox private desktops alive across helper exits ( #44658 ) ...
## Why
Private desktops owned by short-lived sandbox wrappers disappear when those wrappers exit, preventing reuse across filesystem helper requests.
## What changed
- Select and cache private desktops in the calling process, keeping desktops separate for different sandbox permissions.
- Pass the desktop name through the wrapper to the restricted-token and elevated backends so helpers reuse the selected desktop.
- Separate sandbox account preparation from filesystem ACL refresh so desktop selection does not perform the wrapper's refresh.
- Propagate desktop preparation errors and require a desktop name when the wrapper's private desktop flag is set.
## Testing
Add a Windows filesystem regression test covering desktop survival and reuse across reads, writes, metadata queries, and streaming reads, plus separate read-only permissions and rejected writes. Extend wrapper argument tests to cover named desktops and rejection of a missing desktop name.
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4caa5d615d