(On the other hand, I'm not sure why you guys think bug 1967878 **started** making the cursor flickering. The root cause is odd behavior of the external app or driver (or Windows itself). Therefore, that should've already been reproducible even before the fix of bug 1967878. The patches for bug 1967878 indeed may the pointing device handling at a scroll or a layout change, is the slow down causing the flickering?? So, there might be another reason which I've not found.)
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(On the other hand, I'm not sure why you guys think bug 1967878 **started** making the cursor flickering. The root cause is odd behavior of the external app or driver (or Windows itself). Therefore, that should've already been reproducible even before the fix of bug 1967878. The patches for bug 1967878 indeed may made the pointing device handling at a scroll or a layout change slower, so, is the slow down causing the flickering?? That does not make sense, there might be another reason which I've not found.)