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17419aa6b9
The e2e measured the reserved band but never the symptom the change is named for. Headless chromium defaults to an overlay scrollbar, which is the configuration where a bar can cover row content at all, so the scenario already ran in the right mode: against clean master the band is 0 and the bar covers 7px of the relative time. Adds timeCoveredBy, the overlap between the relative time's right edge and the range the bar occupies, taking the bar's width from the sheet where it applies and from the UA's overlay width otherwise. Assuming 0 there would report no occlusion in precisely the state that has it. Keeps the band assertion rather than replacing it: the two catch different regressions. Removing only scrollbar-gutter leaves timeCoveredBy at 0, because the bar is then 8px and the row's right padding is also 8px, so it abuts the timestamp without covering it. Removing the pseudo-element width as well is what produces the overlap. Each was mutation-checked with the other assertions in its test silenced. Records in the note that the gutter and the ::-webkit-scrollbar width are jointly necessary against an overlay bar, measured by deleting each from the live cascade with the other in force: either alone drops the band from 8 to 0.