fix render error when map Frequent changes in size fix #1421 (#1422)

Author: deyihu

src/renderer/map/MapCanvasRenderer.js

@@ -1,4 +1,4 @@
-import { IS_NODE, isNumber, isFunction, requestAnimFrame, cancelAnimFrame, equalMapView } from '../../core/util';
+import { IS_NODE, isNumber, isFunction, requestAnimFrame, cancelAnimFrame, equalMapView, now } from '../../core/util';
 import { createEl, preventSelection, computeDomPosition, addDomEvent, removeDomEvent } from '../../core/util/dom';
 import Browser from '../../core/Browser';
 import Point from '../../geo/Point';
@@ -818,6 +818,9 @@ class MapCanvasRenderer extends MapRenderer {
                         this._resizeObserver.disconnect();
                     } else if (entries.length) {
                         this._checkSize(entries[0].contentRect);
+
+                        //force render all layers,这两句代码不能颠倒，因为要先重置所有图层的size，才能正确的渲染所有图层
+                        this.renderFrame(now());
                     }
                 });
                 this._resizeObserver.observe(this.map._containerDOM);