fix for double click not keeping track with event position #1271
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Don't merge this just yet, but is for testing currently. Fixes #1265
Previously double click wouldn't zoom to correct position. This should fix that, and refactors mousewheel zoom to use the same code now, in a separate method.
Also slight change is the animation easing on double click. There is a bug (existing before this change), where a zoom doesn't follow the correct linear path. The easing doesn't help here, so keeping it simple, so it's slightly less obvious, but ideally needs a fix in the future.