Tab groups can't be moved back to the left after being moved to the right

[maddouri]

Dockview version
6.6.1 + 7.0.2

Framework
React 19

Browser
Chrome 149

Describe the bug
After moving a tab group to the rightmost position, it doesn't seem possible to move it back to the leftmost position or any other position to the left.

Reproduction
Using the "Tab Groups" example:

1. Bring the "Feature" tab group to the right of the tab bar
2. Try bringing the "Feature" tab group to the left of the "Billing" tab or the left of the "Monitoring" tab group
3. Notice how that doesn't work and how the "Feature" tab group remains in the rightmost position.

Please see the video below for an illustration of the problem.

Expected behavior
Moving a tab group behaves like moving a simple tab.

Screenshots / recordings

dockview-tab-groups-cant-be-moved-back.mp4

Additional context
Tab groups are a great addition to Dockview. However, it's undeniable that they seem to have quite a few unexpected behaviors at times. I'm not sure what the best path forward is for making this feature more reliable but kudos for fixing the reported issues anyway :)