title: LeafletJS not loading all tiles until moving map
body: <p>I am trying to load a simple leaflet map in my Ionic 2 app. Unfortunately not all tiles are loaded currectly until a moving the map.</p>
  
  <pre><code>this.map = new L.Map('mainmap', {
        zoomControl: false,
        center: new L.LatLng(40.731253, -73.996139),
        zoom: 12,
        minZoom: 4,
        maxZoom: 19,
        layers: [this.mapService.baseMaps.OpenStreetMap],
        attributionControl: false
      });
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/MPUvv.png" rel="noreferrer"><img src="https://i.stack.imgur.com/MPUvv.png" alt="enter image description here"></a></p>