6768 overdraw fix

src/source/vector_tile_source.js

@@ -130,14 +130,14 @@ class VectorTileSource extends Evented implements Source {
             if (tile.aborted)
                 return callback(null);
 
-            if (err) {
+            if (err && err.status !== 404) {
                 return callback(err);
             }
 
             if (data && data.resourceTiming)
                 tile.resourceTiming = data.resourceTiming;
 
-            if (this.map._refreshExpiredTiles) tile.setExpiryData(data);
+            if (this.map._refreshExpiredTiles && data) tile.setExpiryData(data);
             tile.loadVectorData(data, this.map.painter);
 
             callback(null);

test/ajax_stubs.js

@@ -59,7 +59,8 @@ export const getArrayBuffer = function({ url }, callback) {
             cache[url] = {data: body};
             callback(null, {data: body});
         } else {
-            callback(error || new Error(response.statusCode));
+            if (!error) error = { status: +response.statusCode };
+            callback(error);
         }
     });
 };

test/ignores.json

@@ -11,5 +11,6 @@
   "render-tests/projection/skew": "axonometric rendering in gl-js tbd",
   "render-tests/regressions/mapbox-gl-js#3682": "skip - true",
   "render-tests/runtime-styling/image-update-icon": "skip - https://github.com/mapbox/mapbox-gl-js/issues/4804",
-  "render-tests/runtime-styling/image-update-pattern": "skip - https://github.com/mapbox/mapbox-gl-js/issues/4804"
+  "render-tests/runtime-styling/image-update-pattern": "skip - https://github.com/mapbox/mapbox-gl-js/issues/4804",
+  "render-tests/mixed-zoom/z10-z11": "current behavior conflicts with https://github.com/mapbox/mapbox-gl-js/pull/6803. can be fixed when https://github.com/mapbox/api-maps/issues/1480 is done"
 }

test/integration/render-tests/sparse-tileset/overdraw/style.json

@@ -0,0 +1,39 @@
+{
+  "version": 8,
+  "metadata": {
+    "test": {
+      "height": 256
+    }
+  },
+  "center": [
+    13.418056,
+    52.499167
+  ],
+  "zoom": 1,
+  "sources": {
+    "mapbox": {
+      "type": "vector",
+      "tiles": [
+        "local://tiles/sparse/{z}-{x}-{y}.mvt"
+      ]
+    }
+  },
+  "layers": [
+    {
+      "id": "background-layer",
+      "type": "background",
+      "paint": {
+        "background-color": "forestgreen"
+      }
+    },
+    {
+      "id": "water-layer",
+      "source": "mapbox",
+      "source-layer": "water",
+      "type": "fill",
+      "paint": {
+          "fill-color": "blue"
+      }
+    }
+  ]
+}