When using a mouse to click on the icons of the activity bar, an unwanted focus border will briefly appear.

Does this issue occur when all extensions are disabled?

• Yes

System Info

• VS Code Version: v1.90.2
• OS Version: Linux 6.9 Fedora Linux 40 (Workstation Edition)

Steps to Reproduce

1. This will be easier to notice if you make "activityBar.activeBorder" transparent, so please do it first. Otherwise, you can make your "focusBorder" color different from "activityBar.activeBorder" to observe the issue.
2. Use your mouse to click on the Explorer icon in activity bar, a border will appear briefly.

I have attached a screencast. Unfortunately I couldn't capture my mouse, but you can see that in the video I was clicking on the explorer icon the whole time. A border on the left of explorer icon appears on every click.

Further comments

This only happens with the explorer icon at first, other tabs' icon does not have this kind of UI flickering. However, if you focus on the activity bar and navigate through all the icons with keyboard's arrows, the problem will be reproducable with all icons.

Judging by the fact that this only happens with explorer icon initially, I don't think it's intentional. I also don't like the flickering :/