Add 'allowSelection' option to controls, to determine whether they allow

selection. Use CSS ClassName in FF, and onselectstart attribute in IE, to
control selection. Fix inappropriate overriding of className in some Control
subclasses in order to let this work. Prevents accidental selection of controls
in IE and FF. r=euzuro. (Closes #1378)  


git-svn-id: http://svn.openlayers.org/trunk/openlayers@6727 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/OverviewMap.js

@@ -204,7 +204,7 @@ OpenLayers.Control.OverviewMap = OpenLayers.Class(OpenLayers.Control, {
         // Optionally add min/max buttons if the control will go in the
         // map viewport.
         if(!this.outsideViewport) {
-            this.div.className = this.displayClass + 'Container';
+            this.div.className += " " + this.displayClass + 'Container';
             var imgLocation = OpenLayers.Util.getImagesLocation();
             // maximize button div
             var img = imgLocation + 'layer-switcher-maximize.png';