https://hg.mozilla.org/integration/autoland/rev/47629f89cb6a

changed it so that mFirstContentfulPaintTransactionId was set to something for non-root content documents. In nsPresContext::NotifyDidPaintForSubtree we use the existence of mFirstContentfulPaintTransactionId to determine to call NotifyContentfulPaintForRootContentDocument.

If the intent is to call NotifyContentfulPaintForRootContentDocument for all documents we should change the name, but as it is there are a couple other similarly named functions that do only get called for root content documents so bringing these all to be the same would be good.

Based on the comments in https://phabricator.services.mozilla.com/D124273 I may have mis-understood the problem here. Un-assigning.

Set release status flags based on info from the regressing bug 1518999

Should we close this bug as invalid? thanks

Yeah, I think that's what we'd like to do.