Don't let wrapDateLine maps be wider than one world width.

lib/OpenLayers/Map.js

@@ -1701,6 +1701,30 @@ OpenLayers.Map = OpenLayers.Class({
             this.events.triggerEvent("move");
         }
     },
+    
+    /**
+     * Method: adjustZoom
+     *
+     * Parameters:
+     * zoom - {Number} The zoom level to adjust
+     *
+     * Returns:
+     * {Integer} Adjusted zoom level that shows a map not wider than its
+     * <baseLayer>'s maxExtent.
+     */
+    adjustZoom: function(zoom) {
+        var resolution, resolutions = this.baseLayer.resolutions,
+            maxResolution = this.getMaxExtent().getWidth() / this.getSize().w;
+        if (this.getResolutionForZoom(zoom) > maxResolution) {
+            for (var i=zoom|0, ii=resolutions.length; i<ii; ++i) {
+                if (resolutions[i] <= maxResolution) {
+                    zoom = i;
+                    break;
+                }
+            }
+        }
+        return zoom;
+    },
 
     /**
      * Method: moveTo
@@ -1723,6 +1747,9 @@ OpenLayers.Map = OpenLayers.Class({
                 zoom = Math.round(zoom);
             }
         }
+        if (this.baseLayer.wrapDateLine) {
+            zoom = this.adjustZoom(zoom);
+        }
         // dragging is false by default
         var dragging = options.dragging || this.dragging;
         // forceZoomChange is false by default