put the group color on the right side when the side bar is on the right

[jason919]

The new tab group in the beta works great on both Mac and Windows. I really appreciate it. However, I prefer to have the vertical tabs on the right side. The group color line still stays on the left, which becomes invisible depending on the background color of the website. Could you please move the group color line to the right side (along with the right edge) when it is on the right side?

[Jon]

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