debug tile display: remove the 'ok' tiles from screen when the refresh completes - makes it practical to leave the layer on at all times

code/map_data_debug.js

@@ -49,3 +49,14 @@ window.RenderDebugTiles.prototype.setState = function(id,state) {
   }
   this.setColour (id, col, fill);
 }
+
+
+window.RenderDebugTiles.prototype.removeOkTiles = function() {
+  var _this = this;
+  $.each(this.debugTileToRectangle, function(id,layer) {
+    if (layer.options.color == '#0f0' && layer.options.color == '#0f0') {
+      _this.debugTileLayer.removeLayer(layer);
+      delete _this.debugTileToRectangle[id];
+    }
+  });
+}

code/map_data_request.js

@@ -323,6 +323,7 @@ window.MapDataRequest.prototype.processRequestQueue = function(isFirstPass) {
   if (Object.keys(this.queuedTiles).length == 0) {
 
     this.render.endRenderPass();
+    this.debugTiles.removeOkTiles();
 
     var endTime = new Date().getTime();
     var duration = (endTime - this.refreshStartTime)/1000;