Click+drag on tab causes synced tabs to go out of sync

[kandersolar]

Describe the problem

Tab syncing seems to not work if the activating click is actually a click+drag. A picture is worth 1000 words; here I am highlighting text to make the click+drag more visible:

So the other tab switches when I release the mouse button at the end of the highlight, but the tab I am highlighting does not switch. I'd expect the tabs to switch simultaneously, as they do when using a normal click (not a click+drag).

Link to your repository or website

https://sphinx-design.readthedocs.io/en/furo-theme/tabs.html#synchronised-tabs

Steps to reproduce

1. Go to https://sphinx-design.readthedocs.io/en/furo-theme/tabs.html#synchronised-tabs
2. Click+drag on one of the non-activated tabs.
3. The other tab will switch, but the one you dragged on won't.

The version of Python you're using

N/A

Your operating system

Firefox on Debian

Versions of your packages

No response

Additional context

No response

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