Correctly draw polygons with transparent border

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

@@ -495,6 +495,7 @@ ol.render.webgl.LineStringReplay.prototype.drawReplay = function(gl, context, sk
     gl.enable(gl.DEPTH_TEST);
     gl.depthMask(true);
     gl.depthFunc(gl.NOTEQUAL);
+    gl.clear(gl.DEPTH_BUFFER_BIT);
   }
 
   if (!ol.obj.isEmpty(skippedFeaturesHash)) {
@@ -515,7 +516,6 @@ ol.render.webgl.LineStringReplay.prototype.drawReplay = function(gl, context, sk
     }
   }
   if (!hitDetection) {
-    gl.clear(gl.DEPTH_BUFFER_BIT);
     gl.disable(gl.DEPTH_TEST);
     //Restore GL parameters.
     gl.depthMask(tmpDepthMask);

src/ol/render/webgl/replay.js

@@ -252,6 +252,13 @@ ol.render.webgl.Replay.prototype.replay = function(context,
     featureCallback, oneByOne, opt_hitExtent) {
   var gl = context.getGL();
 
+  if (this.lineStringReplay) {
+    this.lineStringReplay.replay(context,
+        center, resolution, rotation, size, pixelRatio,
+        opacity, skippedFeaturesHash,
+        featureCallback, oneByOne, opt_hitExtent);
+  }
+
   // bind the vertices buffer
   ol.DEBUG && console.assert(this.verticesBuffer,
       'verticesBuffer must not be null');
@@ -299,13 +306,6 @@ ol.render.webgl.Replay.prototype.replay = function(context,
   // disable the vertex attrib arrays
   this.shutDownProgram_(gl, locations);
 
-  if (this.lineStringReplay) {
-    this.lineStringReplay.replay(context,
-        center, resolution, rotation, size, pixelRatio,
-        opacity, skippedFeaturesHash,
-        featureCallback, oneByOne, opt_hitExtent);
-  }
-
   return result;
 };