From cd719ffb3455e2ab3220b37c8de51a87b86bd2cd Mon Sep 17 00:00:00 2001
From: Andreas Hocevar <andreas.hocevar@gmail.com>
Date: Tue, 15 Jun 2021 20:30:43 +0200
Subject: [PATCH] Avoid infinite source tile cache size

---
 src/ol/source/VectorTile.js                    |  3 +++
 test/browser/spec/ol/source/vectortile.test.js | 12 ++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/src/ol/source/VectorTile.js b/src/ol/source/VectorTile.js
index acc23ca846..fc3ee620c7 100644
--- a/src/ol/source/VectorTile.js
+++ b/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;
   }
 }
 
diff --git a/test/browser/spec/ol/source/vectortile.test.js b/test/browser/spec/ol/source/vectortile.test.js
index cc80dbf9dc..949c1f0e59 100644
--- a/test/browser/spec/ol/source/vectortile.test.js
+++ b/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) {