public void Resize(int width, int height) // editor magic.
{
var oldMapTiles = MapTiles.Value;
var oldMapResources = MapResources.Value;
MapTiles = Lazy.New(() => Exts.ResizeArray(oldMapTiles, oldMapTiles[0, 0], width, height));
MapResources = Lazy.New(() => Exts.ResizeArray(oldMapResources, oldMapResources[0, 0], width, height));
MapSize = new int2(width, height);
}