iceweasel-oai 81aee8c86b Preserve Windows startup variables and MXC child environment defaults (#54027) ...

## Why

Windows MXC needs valid host startup variables, while an empty child environment must remain empty for the SDK to select Windows user-profile defaults.

## What changed

- Replace caller overrides of `SystemDrive` and `LOCALAPPDATA` case-insensitively with nonempty Unicode host values, failing before launch if either is unavailable.
- Track whether the original child environment was empty, ignoring launcher transport keys. Supply host `SystemRoot` for launcher bootstrap in that case, then clear the bootstrap environment before the SDK selects defaults.

## Testing

Extend transport tests to cover host-value replacement and preservation of empty child environments. Strengthen the PowerShell fallback RPC test to require `SystemDrive`, `LOCALAPPDATA`, `USERPROFILE`, and `PATH` in the child.

GitOrigin-RevId: a097e1079069ef897ebb5ba5e63546328c5faeaa

2026-10-14 16:31:06 +00:00

..

shell_snapshot.rs

Reject sandbox-writable bubblewrap executables from PATH (#51211)

2026-10-06 00:58:19 +00:00

windows_sandbox.rs

Preserve Windows startup variables and MXC child environment defaults (#54027)

2026-10-14 16:31:06 +00:00