Clear queue in more appropriate places.

lib/OpenLayers/Layer/Grid.js

@@ -228,6 +228,7 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
     removeMap: function(map) {
         if (this.moveTimerId !== null) {
             window.clearTimeout(this.moveTimerId);
+            this.moveTimerId = null;
         }
         this.clearTileQueue();
         if(this.backBufferTimerId !== null) {
@@ -325,10 +326,6 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
             // if grid is empty or zoom has changed, we *must* re-tile
             var forceReTile = !this.grid.length || zoomChanged;
             
-            if (forceReTile) {
-                this.clearTileQueue();
-            }
-
             // total bounds of the tiles
             var tilesBounds = this.getTilesBounds();            
 
@@ -436,8 +433,7 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
         if (this.tileQueue.length === 0) {
             this.clearTileQueue();
         } else {
-            var tile = this.tileQueue.shift();
-            tile.draw(true);
+            this.tileQueue.shift().draw(true);
         }
     },
     
@@ -704,6 +700,7 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
      * bounds - {<OpenLayers.Bounds>}
      */
     initSingleTile: function(bounds) {
+        this.clearTileQueue();
 
         //determine new tile bounds
         var center = bounds.getCenterLonLat();
@@ -815,6 +812,7 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
      * bounds - {<OpenLayers.Bounds>}
      */
     initGriddedTiles:function(bounds) {
+        this.clearTileQueue();
 
         // work out mininum number of rows and columns; this is the number of
         // tiles required to cover the viewport plus at least one for panning