Extras.CalendarSelect fixes for IE 9

  Provided by ScoPi http://echo.nextapp.com/site/node/6715
  This commit propably needs a review as stated in the message:

  So admittedly this may not be the most appropriate way to fix
  the underlying issue, but the bug we've seen in IE 9 when using
  the Extras.CalendarSelect control is addressed by this.
  The symptoms of the bug were two-fold:

	1. The month select field could not be used. It didn't
	   appear to respond to mouse clicks and open.
	2. You had to double-click on a particular day in a month
	   grid to select it as opposed to one click.

  The reason for the above problems appears to have been related
  to a runaway recursive call that only affected IE 9. The below
  fixes this issue specifically for Internet Explorer 9, and
  everything still appears to work fine.

Author: bentolor

src/client/extras/Sync.CalendarSelect.js

@@ -914,10 +914,25 @@ Extras.Sync.CalendarSelect = Core.extend(Echo.Render.ComponentSync, {
         Core.Web.Event.add(this._calendarDiv, "mouseout", Core.method(this, this._processDateRolloverExit), false);
 
         this._updateMonthYearSelection();
-        
-        Core.Web.Image.monitor(this._div, Core.method(this, function() {
-            this._renderSizeUpdate();
-        }));
+        // This stuff handles the runaway recursion that happens in IE 9
+        if (this._numMonitorRegistrations === undefined) {
+            this._numMonitorRegistrations = 0;
+        }
+
+        var registerMonitor = true;
+        if ( (Core.Web.Env.BROWSER_INTERNET_EXPLORER && (Core.Web.Env.BROWSER_VERSION_MAJOR >= 9)) ) {
+            if (this._numMonitorRegistrations > 1) {
+                this._numMonitorRegistrations = 0;
+                registerMonitor = false;
+            }
+        }
+
+        if (registerMonitor) {
+            this._numMonitorRegistrations++;
+            Core.Web.Image.monitor(this._div, Core.method(this, function() {
+                this._renderSizeUpdate();
+            }));
+        }
     },
 
     /** @see Echo.Render.ComponentSync#renderDispose */