Looks like this was regressed by https://hg.mozilla.org/mozilla-central/rev/230b74c414e78e44cc0d589ec704285eb67afb99 I can reproduce this fatal assertion failure by print-previewing the testcase [using the new print dialog]; but it print-previews just fine if I first disable `layout.display-list.improve-fragmentation` in about:config. This seems somewhat concerning (or at least annoying) given that it's a fatal assertion. Hence, classifying as S2 for now. Mats, would you mind taking a look?
Bug 1683126 Comment 2 Edit History
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Looks like this was regressed by https://hg.mozilla.org/mozilla-central/rev/230b74c414e78e44cc0d589ec704285eb67afb99 I can reproduce this fatal assertion failure in a current mozilla-central debug build, by print-previewing the testcase [using the new print dialog]; but it print-previews just fine if I first disable `layout.display-list.improve-fragmentation` in about:config. This seems somewhat concerning (or at least annoying) given that it's a fatal assertion. Hence, classifying as S2 for now. Mats, would you mind taking a look?