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On one website, the touch input fluffing made an audio scrubber so large that it covered other playback controls, making them inaccessible. This patch addresses this problem by changing the top fluffing radius so it more closely matches the bottom radius. In our investigation, we found the top radius was added asymmetrically to the bottom radius without an explanation. We speculate the bottom bias was added because when you touch the screen, you tend to aim with the top part of your finger, near your fingernail, and sometimes the bottom part of your finger will also touch the screen, fat fingering it: if true, we would fluff the event less below the touch point (which is what the code was). I vaguely remember this fat fingering problem in the early 2010's but I haven't thought about it in recent years and I didn't notice this problem in my testing for this patch – perhaps device touch handling has just gotten better. Therefore, we feel safe to remove the bias. Differential Revision: https://phabricator.services.mozilla.com/D124267 |
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