BUGFIX: calling .blur() on the body element unfocus the browser window in IE10

app/assets/javascripts/discourse/routes/discourse_route.js

@@ -54,7 +54,9 @@ Discourse.Route.reopenClass({
     if ($.magnificPopup && $.magnificPopup.instance) { $.magnificPopup.instance.close(); }
 
     // Remove any link focus
-    $(document.activeElement).blur();
+    // NOTE: the '.not("body")' is here to prevent a bug in IE10 on Win7
+    // cf. https://stackoverflow.com/questions/5657371/ie9-window-loses-focus-due-to-jquery-mobile
+    $(document.activeElement).not("body").blur();
 
     Discourse.set('notifyCount',0);
     $('#discourse-modal').modal('hide');