with pinned tabs, new window duplicates all the pinned tabs

[alexwykoff]

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[cndouglas]

Same as #5800?

[bsclifton]

@liunkae yup! good catch. We had punched in a pile of issues when we were all physically present at our first face to face. Many of these issues have dupes (ones we haven't looked at yet are tagged needs-triage if you wanted to help 😄 )