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I'm not surprised. It is not readily discoverable for certain UX reasons that I hypothesize in this neighboring comment:

https://news.ycombinator.com/item?id=38594816

I did not discover it for many years.

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Fair, but for me I remember it being intuitive as it was the first thing that came to mind when wanting to combine two windows into one by dragging the tabs in a convenient manner, or to conveniently rearrange groups of tabs

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