(In reply to Botond Ballo [:botond] from comment #1) > Ah! We have a [check](https://searchfox.org/mozilla-central/rev/064b0f9501ad76802853b43f18e33d8713fd54d3/gfx/layers/apz/src/APZCTreeManager.cpp#3572) for "currently stuck" that we probably need to use in some other codepaths, including the WR one. And the issue in bug 1627326 may well be that that checks only handles bottom and not top.
Bug 1627362 Comment 2 Edit History
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(In reply to Botond Ballo [:botond] from comment #1) > Ah! We have a [check](https://searchfox.org/mozilla-central/rev/064b0f9501ad76802853b43f18e33d8713fd54d3/gfx/layers/apz/src/APZCTreeManager.cpp#3572) for "currently stuck" that we probably need to use in some other codepaths, including the WR one. And the issue in bug 1627326 may well be that that check only handles bottom and not top.