Avoid infinite source tile cache size

src/ol/source/VectorTile.js

@@ -471,6 +471,9 @@ class VectorTile extends UrlTile {
    */
   updateCacheSize(tileCount, projection) {
     super.updateCacheSize(tileCount * 2, projection);
+    this.sourceTileCache.highWaterMark = this.getTileCacheForProjection(
+      projection
+    ).highWaterMark;
   }
 }
 

test/browser/spec/ol/source/vectortile.test.js

@@ -309,6 +309,18 @@ describe('ol.source.VectorTile', function () {
         done();
       }, 0);
     });
+
+    it('adjusts the tile cache size', function (done) {
+      map.renderSync();
+      setTimeout(function () {
+        expect(
+          source.getTileCacheForProjection(map.getView().getProjection())
+            .highWaterMark
+        ).to.be(2);
+        expect(source.sourceTileCache.highWaterMark).to.be(2);
+        done();
+      }, 0);
+    });
   });
 
   it('does not fill up the tile queue', function (done) {