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4d78e80ea1
For some elements, Firefox reports wheel deltas measured in lines (see https://developer.mozilla.org/en-US/docs/Web/API/WheelEvent/deltaMode), which we need to convert to pixels. The previous routine hugely overestimated the conversion factor if the deltaY as slightly bigger (not sure where the exp function came from originally, it does not make much sense IMO). The lines-to-pixels factor does not seem to be quite consistent between different Firefox builds, but this compromise factor should be good enough, I hope. PS: Firefox on Mac OS does not report deltas as lines anymore it seems. closes #10825