[Gecko Bug 1506163] Do not span column-span:all element across all columns if it's under different block formatting context. #14134
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multicol-span-all-004-ref.html is the same as multicol-span-all-004.html except
for the "column-span" value in h3.
Differential Revision: https://phabricator.services.mozilla.com/D12192
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1506163
gecko-commit: a5e00e5b4635a19e9fb4ed3566565504338384c6
gecko-integration-branch: mozilla-inbound
gecko-reviewers: bz