Emilio Cobos Álvarez f4b89f79c7 Bug 1791503 - Don't use stack layout on the root box frame. r=TYLin
Let it stretch instead. This shouldn't change behavior since the root
box frame only supports a single child.

Differential Revision: https://phabricator.services.mozilla.com/D157701
2022-09-21 21:19:12 +00:00
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