Opening PR in a new tab in Agents window results in overly wide PR view

[ulugbekna]

repro:

1. open PR view with description containing another PR link
2. click on that link
3. see the new PR tab to be overly wide

CleanShot.2026-09-06.at.13.27.25.mp4

Version: 1.137.0-insider (Universal)
Commit: b6234bd
Date: 2026-09-03T17:53:45+01:00
Electron: 42.10.0
ElectronBuildId: 15109253
Chromium: 148.0.7778.280
Node.js: 24.18.1
V8: 14.8.178.38-electron.0
@github/copilot: 1.0.83-2
@github/copilot-sdk: 1.0.13-preview.4
OS: Darwin arm64 25.6.0