Bug 1041380 - Add a loading state to e.me search.

After thinking about this some more, I don't think we should set a height here based on item heights. This will give developers a false sense of correctness in the future if we leverage the from/to attributes.

Can we instead get the last item in the grid, and add the y position + the item pixel height? We could then just translateY() the loading indicator to the desired position. Sorry for not bringing this up earlier.