Windows: background Git checks open Terminal windows at turn start (fix commit) #48029

Codex version

Codex App 26.915.4065.0; managed app-server daemon 0.157.0.

Platform

Windows 11 Pro, build 26200.

What happens

Sending a message in a Git repository opens several short-lived Windows Terminal windows. Their tab titles show git.exe. A process trace captured four new OpenConsole.exe instances at a turn start. The Codex app-server daemon launched Git metadata and status commands including rev-parse HEAD, remote -v, and status --porcelain.

Steps to reproduce

1. Open Codex App in a Git repository on Windows with Windows Terminal set as the default terminal application.
2. Send a message to start a turn.
3. Watch for transient Git terminal windows during turn startup.

Expected behavior

Background Git checks should run without creating or focusing terminal windows.

Root cause and proposed fix

codex-rs/git-utils/src/git_process.rs starts these commands through JobObject::spawn_contained. On Windows, the job-object spawn sets CREATE_SUSPENDED but does not set CREATE_NO_WINDOW. Its fallback clears creation flags to zero, so that path can also open a console.

Proposed fix: JRBusiness/codex@67858bd. It combines CREATE_NO_WINDOW with the suspended job-object spawn and retains the no-window flag in the fallback. This is a fork commit because the repository's contribution policy does not accept external pull requests.

Verification

• A local Windows launcher using CREATE_NO_WINDOW ran the same turn-start Git checks with zero new OpenConsole.exe or Windows Terminal processes in the watcher. The upstream patch itself has not been deployed in the Codex App.
• just fmt passed on the proposed patch.
• just test -p codex-git-utils -p codex-utils-pty passed: 63 tests on Windows.

Related: #24910 and #30345.