[core] only update the render order array when there are changes to tiles

1 files changed, 7 insertions, 2 deletions

diff --git a/src/mbgl/map/source.cpp b/src/mbgl/map/source.cpp
index a6fd9665bb..569109a998 100644
--- a/src/mbgl/map/source.cpp
+++ b/src/mbgl/map/source.cpp
@@ -527,9 +527,14 @@ bool Source::update(MapData& data,
 }
 
 void Source::updateTilePtrs() {
-    tilePtrs.clear();
+    std::vector<Tile*> newPtrs;
     for (const auto& pair : tiles) {
-        tilePtrs.push_back(pair.second.get());
+        newPtrs.push_back(pair.second.get());
+    }
+
+    if (tilePtrs != newPtrs) {
+        tilePtrs.swap(newPtrs);
+        emitTileLoaded(true);
     }
 }