merge_pr_49313

Ensure inline elements inside an empty line has zero block-size and no baseline in scrolled block frames.

Differential Revision: https://phabricator.services.mozilla.com/D229709

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1931466
gecko-commit: 160977ed2e6cd8576c70840d388d1a6bcfc07262
gecko-reviewers: layout-reviewers, dholbert