fix for preloading maps tiles

assets/leaflet.edgebuffer.js

@@ -0,0 +1,41 @@
+(function (factory, window) {
+  // define an AMD module that relies on 'leaflet'
+  if (typeof define === 'function' && define.amd) {
+    define(['leaflet'], factory);
+
+    // define a Common JS module that relies on 'leaflet'
+  } else if (typeof exports === 'object') {
+    module.exports = factory(require('leaflet'));
+  }
+
+  // attach your plugin to the global 'L' variable
+  if (typeof window !== 'undefined' && window.L && !window.L.EdgeBuffer) {
+    factory(window.L);
+  }
+}(function (L) {
+  L.EdgeBuffer = {
+    previousMethods: {
+      getTiledPixelBounds: L.GridLayer.prototype._getTiledPixelBounds
+    }
+  };
+
+  L.GridLayer.include({
+
+    _getTiledPixelBounds : function(center, zoom, tileZoom) {
+      var pixelBounds = L.EdgeBuffer.previousMethods.getTiledPixelBounds.call(this, center, zoom, tileZoom);
+
+      // Default is to buffer one tiles beyond the pixel bounds (edgeBufferTiles = 1).
+      var edgeBufferTiles = 1;
+      if ((this.options.edgeBufferTiles !== undefined) && (this.options.edgeBufferTiles !== null)) {
+        edgeBufferTiles = this.options.edgeBufferTiles;
+      }
+
+      if (edgeBufferTiles > 0) {
+        var pixelEdgeBuffer = L.GridLayer.prototype.getTileSize.call(this).multiplyBy(edgeBufferTiles);
+        pixelBounds = new L.Bounds(pixelBounds.min.subtract(pixelEdgeBuffer), pixelBounds.max.add(pixelEdgeBuffer));
+      }
+      return pixelBounds;
+    }
+  });
+
+}, window));

js/src/forum/index.js

@@ -11,6 +11,13 @@ app.initializers.add('justoverclock/users-map-location', () => {
   User.prototype.location = Model.attribute('location');
 
   extend(UserCard.prototype, 'oncreate', function () {
+
+    let script = document.createElement('script');
+    script.type = 'text/javascript';
+    script.src = app.forum.attribute('baseUrl') + '/assets/extensions/justoverclock-users-map-location/leaflet.edgebuffer.js'
+
+    document.head.appendChild(script);
+
     const user = this.attrs.user;
     let UserLocation = user.location();
     const publicToken = app.forum.attribute('justoverclock-users-map-location.mapBox-api-key');