Random fixes

[bgilbert6]

I thought maybe you'd want to integrate some of these. I added Y value sorting, hiding the layer when zooming so it doesn't appear all weird looking, A fix for marker clicking not working in case where you create the popup after the marker is created, and also the bounding box wasn't correct for me so I changed the Y value min/max on the rbush thing.

I also adding padding around the marker drawing search, otherwise it would popup markers in. I think the padding values should be based on the largest icon?

[Spaction]

Instead of taking the full size, the ret below should be using the X/Y Anchor for the adjustment.
I'm assuming your image has an anchor adjustment which is not being accounted for in the hover-over\click box of the icon, so the mouse hover over interactivity is off from what you are seeing drawn.

[bgilbert6]

Yes there was something weird there. Here is the marker code I had:

I didn't use anything weird in the code, so seems like this library should be able to automatically adjust shouldn't it?

Removing the /2 100% fixed it.

var customIcon = L.icon({
    iconUrl: myicon,
    iconSize: [35, 35], // size of the icon
    iconAnchor: [17.5, 35],
    popupAnchor: [0, -40]
});

[Spaction]

Its not exactly something being weird, just using it in a manor which myself and others aren't. I really don't use anchors often if at all, so it is definitely something I would notice during my day to day use.

Thanks for the code though, i'll try to play around with it and adjust things.