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Do not dispatch 'move' event if no drag
The panBy method is used by zoomBy, and the latter assumes that panBy will always dispatch an event. If that's not the case, then we'll need some additional logic in zoomBy to dispatch an event, or we'll need an internal panning method that does the pan but not the dispatch… So, it's a bit more complicated than this simple fix. :)
Thank you for your feedback !
... you're right then, it is not as simple as it looked at first sight.
cool. this has been bugging me and I've never gotten around to fixing it myself.