I'm kind of uneasy about letting table wrapper frames be reflow roots, due to their inner table frame wanting to have a CB ReflowInput pointer. I'm tempted to just fix this bug by exempting them from being promoted to reflow roots (via a tweak to the codepath added in bug 1497414).
Bug 1555757 Comment 5 Edit History
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I'm kind of uneasy about letting table wrapper frames be reflow roots, due to their inner table frame wanting to have a CB ReflowInput pointer as described in comment 3. I'm tempted to just fix this bug by exempting them from being promoted to reflow roots (via a tweak to the codepath added in bug 1497414).