Agents window: Toggling aux sidebar visibility is changing last focused sidebar panel

[ulugbekna]

repro:

1. open aux sidebar
2. open a file
3. hide and unhide the aux sidebar - 🐛 see the focused panel to change to Changes

CleanShot.2026-08-18.at.13.49.46.mp4

Version: 1.134.0-insider (Universal)
Commit: d1d9960
Date: 2026-08-17T20:35:55-07:00
Electron: 42.8.1
ElectronBuildId: 14906494
Chromium: 148.0.7778.280
Node.js: 24.18.1
V8: 14.8.178.38-electron.0
@github/copilot: 1.0.81-0
@github/copilot-sdk: 1.0.11
OS: d1d9960

[sandy081]

Ulugbek Abdullaev (@ulugbekna) I see in the video changes tab focused before and after

[ulugbekna]

Sandeep Somavarapu (@sandy081) oh sorry, wrong video was attached; fixed