Allow for a different vertical margin vs. horizontal margin

[EBeatles]

I have some stacked events, but they are stacking higher than necessary because of horizontal spacing. eventMargin appears to control both horizontal and vertical spacing. If I drop it to 0, the stacking corrects to the appropriate height. If I change back to 10, the height of a group is 1 taller than it needs to be. Having an eventMarginHeight and eventMarginWidth would solve this.

Here it is with eventMargin = 10:

Here it is with eventMargin = 0;

[josdejong]

Thanks for your suggestion.

Note that in the successor of chap-links-library, vis.js, this is actually implemented, you can separately configure horizontal and vertical margins.