Fix skipping replay

src/ol/render/webgl/circlereplay/index.js

@@ -345,6 +345,7 @@ ol.render.webgl.CircleReplay.prototype.drawReplaySkipping_ = function(gl, contex
     if (start !== end) {
       this.drawElements(gl, context, start, end);
     }
+    start = end = groupStart;
   }
 };
 

src/ol/render/webgl/linestringreplay/index.js

@@ -563,6 +563,7 @@ ol.render.webgl.LineStringReplay.prototype.drawReplaySkipping_ = function(gl, co
       this.drawElements(gl, context, start, end);
       gl.clear(gl.DEPTH_BUFFER_BIT);
     }
+    start = end = groupStart;
   }
 };
 

src/ol/render/webgl/polygonreplay/index.js

@@ -971,6 +971,7 @@ ol.render.webgl.PolygonReplay.prototype.drawReplaySkipping_ = function(gl, conte
     if (start !== end) {
       this.drawElements(gl, context, start, end);
     }
+    start = end = groupStart;
   }
 };