Almost impossible to debug. element.offsets is cached (3x speedup -- a change

made in the early days of openlayers) but the cache means that relative mouse
positions are off if your first mouse event over the map is *after* the page is
scrolled. This closes #333 , and fixes a long standing not-well understood bug.


git-svn-id: http://svn.openlayers.org/trunk/openlayers@1692 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Events.js

@@ -319,6 +319,10 @@ OpenLayers.Events.prototype = {
     getMousePosition: function (evt) {
         if (!this.element.offsets) {
             this.element.offsets = OpenLayers.Util.pagePosition(this.element);
+            this.element.offsets[0] += (document.documentElement.scrollLeft
+                         || document.body.scrollLeft);
+            this.element.offsets[1] += (document.documentElement.scrollTop
+                         || document.body.scrollTop);
         }
         return new OpenLayers.Pixel(
             (evt.clientX + (document.documentElement.scrollLeft