Steps to reproduce: 1. On Windows 10, with WebRender enabled, go to https://perfht.ml/2DemxDI . 2. After the profile has loaded, press and hold the down arrow key on your keyboard. Expected results: The selection should move through the treeview and the canvas should update its highlighted areas based on the selection. Actual results: The canvas shows intermittent black flashing, see the screen recording. This reproduces on a local build with a fresh profile. I can not reproduce it on today's Nightly with my main profile. I have not tested other permutations.
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Steps to reproduce: 1. On Windows 10, with WebRender enabled, go to https://perfht.ml/2DemxDI . 2. After the profile has loaded, press and hold the down arrow key on your keyboard. Expected results: The selection should move through the treeview and the canvas should update its highlighted areas based on the selection. Actual results: The canvas shows intermittent black flashing, see the screen recording. This reproduces on a local build from revision [ec1f3a922d56](https://hg.mozilla.org/mozilla-central/rev/ec1f3a922d56) with a fresh profile. I can not reproduce it on today's Nightly with my main profile. I have not tested other permutations.