Feature Request: Focus layer in multi layer

[austenstone]

It would be nice to be able to display a specific layer at the top when using allowMultiLayer: true.

Today it's difficult to actually manage the items on different layers.

Maybe recalculate the z-index with something like

(item.layerIndex + this.gridster.$options.layerOffset) % this.gridster.maxLayerIndex

This way the zindex is relative to the current layer offset. You can move through layers by iterating layerOffset from 0 to maxLayerIndex.

References: Added allow widget in multiple layers #599