Feature Suggestion: pre-fetching surrounding (extra) tiles

Hi,

How about adding an option to allow pre-fetching extra tiles? I believe it will improve user experience with fast network, since the user will not see white space ultil loading done. With slow network, it will spoil performance though. I’d apologize if this had been considered already.

--- leaflet-src.js      2017-05-28 10:30:08.435964020 +0900
+++ leaflet-src.js_tilemargin   2017-05-29 19:32:16.399501929 +0900
@@ -5486,9 +5486,10 @@
 
        _pxBoundsToTileRange: function (bounds) {
                var tileSize = this.getTileSize();
+               var margin = this.options.tileMargin;   // default: 0
                return new L.Bounds(
-                       bounds.min.unscaleBy(tileSize).floor(),
-                       bounds.max.unscaleBy(tileSize).ceil().subtract([1, 1]));
+                       bounds.min.unscaleBy(tileSize).floor().subtract([margin, margin]),
+                       bounds.max.unscaleBy(tileSize).ceil().add([margin - 1 , margin - 1]));
        },
 
        _noTilesToLoad: function () {

[geoloep]

@SvenLauterbach Have you tried the padding option of the renderer you use? http://leafletjs.com/reference-1.0.3.html#renderer.

[kaynz]

https://github.com/TolonUK/Leaflet.EdgeBuffer