Basic working implementation of L.TileLayer.refresh()

gistfile1.txt

L.TileLayer2 = L.TileLayer.extend({
        _refreshTileUrl: function(tile, url) {
                //use a image in background, so that only replace the actual tile, once image is loaded in cache!
                var img = new Image();
                img.onload = function() {
                        L.Util.requestAnimFrame(function() {
                                 tile.el.src = url;
                        });
                }
                img.src = url;
        },
        refresh: function() {
                //prevent _tileOnLoad/_tileReady re-triggering a opacity animation
                var wasAnimated = this._map._fadeAnimated;
                this._map._fadeAnimated = false;

                for (var key in this._tiles) {
                        tile = this._tiles[key];
                        if (tile.current && tile.active) {
                                var oldsrc = tile.el.src;
                                var newsrc = this.getTileUrl(tile.coords);
                                if (oldsrc != newsrc) {
                                        //L.DomEvent.off(tile, 'load', this._tileOnLoad); ... this doesnt work!

                                        this._refreshTileUrl(tile,newsrc);
                                }
                        }
                }

                if (wasAnimated)
                        setTimeout(function() { map._fadeAnimated = wasAnimated; }, 5000);
        }
});
L.tileLayer2 = function(url, options) {
    return new L.TileLayer2(url, options);
}