Next/Previous tab not working properly in Dia Browser

Describe the bug

The order of tabs is very confusing. For example, I open four tabs: A-B-C-D, and everything works fine. However, when the tabs are reordered to A-C-B-D, if I am in tab B and move to the next tab, instead of going to D, I end up in C.

To Reproduce

1. Open four tabs in your browser.
2. Use Vimium to navigate between them and confirm the order works as expected.
3. Manually reorder the tabs (e.g., drag tab B after tab C so the order is A-C-B-D).
4. Focus on tab B.
5. Use Vimium’s command to move to the next tab.
6. Observe that instead of moving to tab D, you are taken to tab C.

Browser and Vimium version

Dia: Version 0.37.1 (65361) Chromium Engine Version 138.0.7204.101
Vimium: Latest

I can confirm that Vimium works well in Chrome; this issue only occurs in Dia. Also, when I use Dia's own shortcut Shift+Cmd+[ or ], it correctly moves to the next or previous tab.

Start by reproducing the reordered-tab case in Dia using Vimium’s next and previous tab commands, then compare the result with Dia’s Shift+Cmd+[ or ] shortcuts and the same workflow in Chrome. Done means Vimium follows the visible tab order after tabs are dragged, in both directions, without changing the working Chrome behavior.