Vouch Request

[dzhlobo]

What do you want to change?

I'd like to fix the issue about window border being visible in non-native fullscreen: #9582

Why do you want to make this change?

I use Ghostty in non-native fullscreen myself and the issue bothers me a lot.

I acknowledge that:

• I have read the Contributing Guide and understand the contribution process.
• I have read and agree to follow the AI Usage Policy.
• I wrote this vouch request myself, in my own voice, without AI generating it.

[mitchellh]

!vouch