Tabs width resizing glitch during "traffic lights" visibility changes

[rkrenecky]

Hi DuckDuckGo team 👋,

I’ve encountered a minor UI glitch related to tabs resizing during "traffic lights” (minimize/close/fullscreen buttons) visibility changes in fullscreen mode. Here are the details:

Steps to Reproduce

1. Open enough tabs to fill the entire screen width while in fullscreen mode.
2. Move the cursor to the top to make the traffic lights appear, and observe the behavior of the tabs:
   • Tabs shift positions smoothly to make space for the traffic lights.
   • Tab width changes in discrete steps, causing a jarring visual effect.

Expected Behavior

Tab widths should resize smoothly and consistently, matching the smooth movement of the tab positions during traffic lights visibility changes.

Observed Behavior

Tab widths resize in discrete steps, creating a noticeable mismatch between the smooth adjustment of the tab positions and the resizing of their widths.

Environment

• App Version: 1.118.0 (329)
• macOS Version: Sequoia 15.2

Video Evidence

tabs-glitch.mov