UI is often displaying a continuous stream of characters representing my mouse movements

### Describe the bug

Often on first load, I see a big stream of characters representing my mouse movements, rather than a functioning UI, in addition to the initial session character stream. I don't believe I'm able to prompt after this happens. Often fixes itself after reload. Also on reload it often is updated to the next copilot version, which makes me wonder if it's a byproduct of how copilot is loaded when the auto-update runs first.

Example output:
/ search . enter details . o open . c chat . tab next tab^[[<35;145;1M^[[<35;142;2M^[[<35;138;4M^[[<35;135;5M^[[<35;131;6M^[[<35;129;7M^[[<35;126;8M^[[<35;123;9M^[[<35;121;9M^[[<
35;117;10M^[[<35;114;11M^[[<35;112;12M^[[<35;109;12M^[[<35;106;13M^[[<35;102;13M^[[<35;100;14M^[[<35;97;14M^[[<35;95;14M^[[<35;93;14M^[[<35;93;15M^[[<35;92;15M^[[<35;91;15M^[[<35;
88;14M^[[<35;83;13M^[[<35;78;13M^[[<35;74;12M^[[<35;71;11M^[[<35;65;11M^[[<35;61;10M^[[<35;57;9M^[[<35;55;8M^[[<35;54;8M^[[<35;54;7M^[[<35;54;6M^[[<35;55;6M^[[<35;56;5M^[[<35;57;5
M^[[<35;59;5M^[[<35;61;5M^[[<35;63;5M^[[<35;66;4M^[[<35;69;4M^[[<35;74;4M^[[<35;79;5M^[[<35;83;5M^[[<35;86;5M^[[<35;91;6M^[[<35;96;6....

### Affected version

Now on 1.0.66-1, been happening for about a week

### Steps to reproduce the behavior

On a github, codespace, looking through VSCode , Agency 2026.6.28.1
VSCode Version: 1.126.0 (user setup)
Other VS Code details:
Electron: 42.2.0
ElectronBuildId: 14159160
Chromium: 148.0.7778.97
Node.js: 24.15.0
V8: 14.8.178.14-electron.0

### Expected behavior

Not this happening

### Additional context

bash

Nenhum arquivo-fonte ou teste foi especificado. Comece reproduzindo a falha no primeiro carregamento em um GitHub Codespace enquanto visualiza pelo VS Code, comparando a inicialização normal, o recarregamento e o momento relatado da atualização automática do Copilot; está concluído quando as sequências de escape do mouse não aparecem mais como texto do terminal e a UI permanece utilizável.

Escrita pelo modelo de indexação a partir do texto da issue.