workaround for MAPCACHE-424, will keep in place until Leaflet/Leaflet…

…#3575 is resolved

src/lib/vendor.js

@@ -16,4 +16,19 @@ L.Icon.Default.mergeOptions({
   shadowUrl: markerShadow
 })
 
+/*
+ * Workaround for 1px lines appearing in some browsers due to fractional transforms
+ * and resulting anti-aliasing.
+ * https://github.com/Leaflet/Leaflet/issues/3575
+ */
+const originalInitTile = L.GridLayer.prototype._initTile
+L.GridLayer.include({
+  _initTile: function (tile) {
+    originalInitTile.call(this, tile)
+    var tileSize = this.getTileSize()
+    tile.style.width = tileSize.x + 1 + 'px'
+    tile.style.height = tileSize.y + 1 + 'px'
+  }
+})
+
 export * as L from 'leaflet'