[Gecko Bug 1524431] Part 2 - Check IsBidiSplittable() before processing the ancestor frames. #17275
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The idea is to check IsBidiSplittable() in more places to prevent fixed
continuations created by column-span from becoming fluid ones.
Differential Revision: https://phabricator.services.mozilla.com/D34093
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1524431
gecko-commit: 6f0a648c3d83086a400c87067e6fd6e584207ae6
gecko-integration-branch: autoland
gecko-reviewers: jfkthame