When panning by large distances, OpenLayers previously created all the grid

space inbetween. This no longer happens -- instead, the grid will re-init if 
the bounds is not at least partially contained by the existing box.


git-svn-id: http://svn.openlayers.org/trunk/openlayers@1074 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Grid.js

@@ -148,7 +148,9 @@ OpenLayers.Layer.Grid.prototype =
             } else {
                 if (!this.grid || zoomChanged) {
                     this._initTiles();
-                } else { 
+                } else if (this.getGridBounds().containsBounds(bounds, true) == false) { 
+                    this._initTiles();
+                } else {
                     var i = 0;
                     while (this.getGridBounds().bottom > bounds.bottom) {
                        this.insertRow(false);