LeavePresShell takes an optional displaylist that it uses to check for is non-blank paint (and soon is contentful paint). When we take the failure early return paths from AttemptPartialUpdate, our current display list is invalid (may contain deleted items from list paint), so we shouldn't be passing it to LeavePresShell to analyze.
Assignee: nobody → rjesup
Status: NEW → ASSIGNED
Attachment #9025181 - Flags: review?(matt.woodrow) → review+
Pushed by email@example.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/73de6b136855 don't pass an invalid list to LeavePresShell on partial updates r=mattwoodrow
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