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8384f8fe05
Before, touchpads would give "smoother" scrolling by delivering lots of mousewheel events with small distance changes. Because the code only looked at the sign of deltaY, ten 5px scrolls would zoom 10x more than one 50px scroll. This change makes zooming with a touchpad more like zooming with a mousewheel. On my laptop, a full-scale zoom (fully out to fully in) was about a 5mm finger movement before, and is now about 3cm. Fixes #758.