fix: normalize scale delta during various environments #33
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fix #26
I realized we already can scroll with Shift + scroll and zoom with Ctrl + scroll. So I would keep this behavior as official keyboard shortcut.
But there are some inconsistency of
deltaYon WheelEvent during various environments. e.g. Windows + mouse provides too large value fordeltaY. So I have normalized it not to change scale too much by one wheel event.