Actually, my patch relies on the already existing method of tracking user interaction ([https://searchfox.org/mozilla-central/source/dom/events/EventStateManager.cpp#913]), which is separate from the UserActivation API, and so our interaction state *does* include scrolling. This seems like a reasonable followup, however.
Bug 1645218 Comment 2 Edit History
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Actually, my patch relies on the already existing method of tracking user interaction (https://searchfox.org/mozilla-central/source/dom/events/EventStateManager.cpp#913), which is separate from the UserActivation API, and so our interaction state *does* include scrolling. This seems like a reasonable followup, however.