onLoadMore is not triggered when panning to the right

[johanhenriksson]

The onLoadMore callback is not triggered when panning to the right, and looking at the code it looks like this is the intended behaviour. Is there any reason for this? It seems to me that this is a missing feature, and something I need for myself.

As an example use case, I need to have controls to jump to a specific date/time. The chart should then be able to automatically load new data when panning both forwards and backwards from this point.

I'm considering fixing it and submitting a pull request. If so, any thoughts on how it should be implemented? Right now I'm thinking perhaps it should be a new callback in order to avoid breaking existing behaviour. Maybe it could be called something like onLoadAfter instead.