Store source tiles on render tile instead of source

src/ol/VectorRenderTile.js

@@ -67,6 +67,11 @@ class VectorRenderTile extends Tile {
      */
     this.replayState_ = {};
 
+    /**
+     * @type {Array<import("./VectorTile.js").default>}
+     */
+    this.sourceTiles = null;
+
     /**
      * @type {number}
      */

src/ol/source/VectorTile.js

@@ -144,12 +144,6 @@ class VectorTile extends UrlTile {
      */
     this.sourceTileCache = new TileCache(this.tileCache.highWaterMark);
 
-    /**
-     * @private
-     * @type {Object<string, Array<import("../VectorTile.js").default>>}
-     */
-    this.sourceTilesByTileKey_ = {};
-
     /**
      * @private
      * @type {boolean}
@@ -229,7 +223,6 @@ class VectorTile extends UrlTile {
   clear() {
     this.tileCache.clear();
     this.sourceTileCache.clear();
-    this.sourceTilesByTileKey_ = {};
   }
 
   /**
@@ -254,7 +247,7 @@ class VectorTile extends UrlTile {
     const sourceZ = sourceTileGrid.getZForResolution(resolution, 1);
     const minZoom = sourceTileGrid.getMinZoom();
 
-    const previousSourceTiles = this.sourceTilesByTileKey_[tile.getKey()];
+    const previousSourceTiles = tile.sourceTiles;
     let sourceTiles, covered, loadedZ;
     if (previousSourceTiles && previousSourceTiles.length > 0 && previousSourceTiles[0].tileCoord[0] === sourceZ) {
       sourceTiles = previousSourceTiles;
@@ -330,29 +323,13 @@ class VectorTile extends UrlTile {
       if (tile.getState() < TileState.LOADED) {
         tile.setState(TileState.LOADED);
       } else if (!previousSourceTiles || !equals(sourceTiles, previousSourceTiles)) {
-        this.removeSourceTiles(tile);
+        tile.sourceTiles = sourceTiles;
-        this.addSourceTiles(tile, sourceTiles);
       }
     }
     this.sourceTileCache.expireCache({});
     return sourceTiles;
   }
 
-  /**
-   * @param {VectorRenderTile} tile Tile.
-   * @param {Array<import("../VectorTile").default>} sourceTiles Source tiles.
-   */
-  addSourceTiles(tile, sourceTiles) {
-    this.sourceTilesByTileKey_[tile.getKey()] = sourceTiles;
-  }
-
-  /**
-   * @param {VectorRenderTile} tile Tile.
-   */
-  removeSourceTiles(tile) {
-    delete this.sourceTilesByTileKey_[tile.getKey()];
-  }
-
   /**
    * @inheritDoc
    */

test/spec/ol/renderer/canvas/vectortilelayer.test.js

@@ -316,10 +316,10 @@ describe('ol.renderer.canvas.VectorTileLayer', function() {
         tileGrid: createXYZ()
       });
       source.sourceTileCache.set('0/0/0.mvt', sourceTile);
-      source.sourceTilesByTileKey_[sourceTile.getKey()] = [sourceTile];
       executorGroup = {};
       source.getTile = function() {
         const tile = VectorTileSource.prototype.getTile.apply(source, arguments);
+        tile.sourceTiles = [sourceTile];
         tile.executorGroups[getUid(layer)] = [executorGroup];
         return tile;
       };