Constant tab bar drop area redrawing/flickering

[hmemcpy]

Check for existing issues

• [X] Completed

Describe the bug / provide steps to reproduce it

I encountered this while working on #6818.

With @maxdeviant's help, I added debug_bg_cyan to visualize the problem: the "clickable" area is constantly shrinking to a small rectangle, preventing the full use of the "double-click to open a new buffer" feature.

I understand this issue is already known, but I couldn't find this specific ticket. If duplicate - please feel free to close!

Environment

Zed: v0.125.0 (Zed Dev) OS: macOS 14.3.1 Memory: 32 GiB Architecture: aarch64

If applicable, add mockups / screenshots to help explain present your vision of the feature

If applicable, attach your ~/Library/Logs/Zed/Zed.log file to this issue.

If you only need the most recent lines, you can run the zed: open log command palette action to see the last 1000.

No response

[Moshyfawn]

There is a similar issue currently active in #8598 regarding the project panel, which may have the same underlining cause, but let's leave your issue open for now.