Fix bug where message preview was unintentionally reset on check-recent action (#1490563)

CHANGELOG

@@ -5,6 +5,7 @@ CHANGELOG Roundcube Webmail
 - Make brute force attacks harder by re-generating security token on every failed login (#1490549)
 - Fix so database_attachments::cleanup() does not remove attachments from other sessions (#1490542)
 - Fix responses list update issue after response name change (#1490555)
+- Fix bug where message preview was unintentionally reset on check-recent action (#1490563)
 
 RELEASE 1.1.3
 -------------

program/js/app.js

@@ -2488,22 +2488,23 @@ function rcube_webmail()
   // removes messages that doesn't exists from list selection array
   this.update_selection = function()
   {
-    var selected = this.message_list.selection,
-      rows = this.message_list.rows,
+    var list = this.message_list,
+      selected = list.selection,
+      rows = list.rows,
       i, selection = [];
 
     for (i in selected)
       if (rows[selected[i]])
         selection.push(selected[i]);
 
-    this.message_list.selection = selection;
+    list.selection = selection;
 
     // reset preview frame, if currently previewed message is not selected (has been removed)
     try {
       var win = this.get_frame_window(this.env.contentframe),
         id = win.rcmail.env.uid;
 
-      if (id && $.inArray(id, selection) < 0)
+      if (id && !list.in_selection(id))
         this.show_contentframe(false);
     }
     catch (e) {};