Remove label cache, render text directly to target canvas

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

@@ -6,7 +6,6 @@ import Circle from '../../../../../src/ol/geom/Circle.js';
 import Point from '../../../../../src/ol/geom/Point.js';
 import {fromExtent} from '../../../../../src/ol/geom/Polygon.js';
 import VectorLayer from '../../../../../src/ol/layer/Vector.js';
-import {clear} from '../../../../../src/ol/obj.js';
 import {get as getProjection} from '../../../../../src/ol/proj.js';
 import {checkedFonts} from '../../../../../src/ol/render/canvas.js';
 import CanvasVectorLayerRenderer from '../../../../../src/ol/renderer/canvas/VectorLayer.js';
@@ -88,7 +87,7 @@ describe('ol.renderer.canvas.VectorLayer', function() {
     });
 
     it('does not re-render for unavailable fonts', function(done) {
-      clear(checkedFonts);
+      checkedFonts.values_ = {};
       const map = new Map({
         view: new View({
           center: [0, 0],
@@ -119,7 +118,7 @@ describe('ol.renderer.canvas.VectorLayer', function() {
     });
 
     it('does not re-render for available fonts', function(done) {
-      clear(checkedFonts);
+      checkedFonts.values_ = {};
       const map = new Map({
         view: new View({
           center: [0, 0],
@@ -150,7 +149,7 @@ describe('ol.renderer.canvas.VectorLayer', function() {
     });
 
     it('re-renders for fonts that become available', function(done) {
-      clear(checkedFonts);
+      checkedFonts.values_ = {};
       head.appendChild(font);
       const map = new Map({
         view: new View({