Davey-Hughes vouch request for gtk mouse change

[Davey-Hughes]

What do you want to change?

I was having an issue where mouse clicks in ghostty would randomly become pretty unresponsive, and finally looked into it. There's some other issues/discussions of similar things happening though I'm not sure if my fix solves their issue. It ended up being side mouse buttons getting stuck as "clicked" in ghostty which interfered with normal left and right clicks.

Why do you want to make this change?

This potentially affects every user who clicks in ghostty. The symptoms are similar to this issue but I'm not sure if it's the exact same: #11342

My setup is Linux + Wayland and I can't recreate the symptoms on MacOS, but perhaps other users with similar setups to me will benefit.

EDIT: with some more digging it seems like it may be more similar to this issue: #10713

EDIT2: I figured I could link the commit I intend to open a PR with: Davey-Hughes@0b2932b

I did use an LLM for this, mostly because I'm not that experienced with zig or this codebase. Tbh I'm not sure if this is the best fix- the condition is that the other mouse buttons like 1-5 may belong to other gestures, but it's possible that this shouldn't be its own function. Would love to get feedback on this.

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.

[jcollie]

!vouch