webui: Greatly reduces application memory leak for dashboard (#7215)

html/pages/front/tiles.php

@@ -591,6 +591,9 @@ if (strpos($dash_config, 'globe') !== false) {
     }
 
     function widget_reload(id,data_type) {
+        $(".bootgrid-table").bootgrid("destroy");
+        $("#widget_body_"+id+" *").off();
+        $("#widget_body_"+id).empty();
         if( $("#widget_body_"+id).parent().data('settings') == 1 ) {
             settings = 1;
         } else {

lib/jquery-bootgrid/dist/jquery.bootgrid.js

@@ -883,7 +883,7 @@
         placeholder.each(function (index, item)
         {
             // todo: check how append is implemented. Perhaps cloning here is superfluous.
-            $(item).before(element.clone(true)).remove();
+            $(item).before(element).remove();
         });
     }