Trackpad PixelDelta events arrive divided by the HiDPI scale factor, making trackpad scrolling far slower than other apps on scaled Wayland desktops. In FlickableData::scroll_delta, distinguish line-based wheel deltas (always exact multiples of 60) from pixel-precise trackpad deltas and apply a 2.75x factor to the latter only; wheel and fling scrolling are unchanged. Resolves#588.
cc
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