Clean up properly when clearing label cache

src/ol/render/canvas.js

@@ -243,7 +243,9 @@ export const checkFont = (function() {
           // Make sure that loaded fonts are picked up by Safari
           measureContext = null;
           measureFont = undefined;
+          if (labelCache.getCount()) {
           labelCache.clear();
+          }
         } else {
           ++checked[font];
           done = false;

src/ol/render/canvas/LabelCache.js

@@ -21,8 +21,8 @@ class LabelCache extends LRUCache {
   }
 
   clear() {
-    super.clear();
     this.consumers = {};
+    super.clear();
   }
 
   /**

src/ol/renderer/canvas/VectorTileLayer.js

@@ -24,6 +24,7 @@ import {
   makeInverse
 } from '../../transform.js';
 import CanvasExecutorGroup, {replayDeclutter} from '../../render/canvas/ExecutorGroup.js';
+import {clear} from '../../obj.js';
 
 
 /**
@@ -378,6 +379,7 @@ class CanvasVectorTileLayerRenderer extends CanvasTileLayerRenderer {
    * @inheritDoc
    */
   handleFontsChanged() {
+    clear(this.renderTileImageQueue_);
     const layer = this.getLayer();
     if (layer.getVisible() && this.renderedLayerRevision_ !== undefined) {
       layer.changed();