Issue #2859242: Tabs do not stack correctly when placed outside (or not at the...

Alberto Padernorequested to merge
cherry-pick-16343163 into 2.0.x

Issue #2859242: Tabs do not stack correctly when placed outside (or not at the bottom of) the header region

(cherry picked from commit 16343163)

16343163 Issue #2859242: Tabs do not stack correctly when placed outside (or not at the...

Co-authored-by: Alberto Paderno 22536-avpaderno@users.noreply.drupalcode.org

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