Clarify keep-alive setting, move it to User Interface section, change label

to "Refresh (check for new messages, etc.)", allow no-refresh mode.

config/main.inc.php.dist

@@ -241,7 +241,6 @@ $rcmail_config['skin_include_php'] = false;
 $rcmail_config['display_version'] = false;
 
 // Session lifetime in minutes
-// must be greater than 'keep_alive'/60
 $rcmail_config['session_lifetime'] = 10;
 
 // Session domain: .example.org
@@ -500,7 +499,6 @@ $rcmail_config['recipients_separator'] = ',';
 $rcmail_config['max_pagesize'] = 200;
 
 // Minimal value of user's 'keep_alive' setting (in seconds)
-// Must be less than 'session_lifetime'
 $rcmail_config['min_keep_alive'] = 60;
 
 // Enables files upload indicator. Requires APC installed and enabled apc.rfc1867 option.
@@ -780,8 +778,9 @@ $rcmail_config['read_when_deleted'] = true;
 // Use 'Purge' to remove messages marked as deleted
 $rcmail_config['flag_for_deletion'] = false;
 
-// Default interval for keep-alive/check-recent requests (in seconds)
-// Must be greater than or equal to 'min_keep_alive' and less than 'session_lifetime'
+// Default interval for auto-refresh requests (in seconds)
+// These are requests for system state updates e.g. checking for new messages, etc.
+// Setting it to 0 disables the feature.
 $rcmail_config['keep_alive'] = 60;
 
 // If true all folders will be checked for recent messages

program/localization/en_US/labels.inc

@@ -414,7 +414,7 @@ $labels['always'] = 'always';
 $labels['showinlineimages'] = 'Display attached images below the message';
 $labels['autosavedraft']  = 'Automatically save draft';
 $labels['everynminutes']  = 'every $n minute(s)';
-$labels['keepalive']  = 'Check for new messages on';
+$labels['refreshinterval']  = 'Refresh (check for new messages, etc.)';
 $labels['never']  = 'never';
 $labels['immediately']  = 'immediately';
 $labels['messagesdisplaying'] = 'Displaying Messages';

program/steps/settings/func.inc

@@ -237,6 +237,24 @@ function rcmail_user_prefs($current=null)
       );
     }
 
+    if (!isset($no_override['keep_alive'])) {
+      $field_id = 'rcmfd_keep_alive';
+      $select_keep_alive = new html_select(array('name' => '_keep_alive', 'id' => $field_id));
+
+      $select_keep_alive->add(rcube_label('never'), 0);
+      foreach (array(1, 3, 5, 10, 15, 30, 60) as $min) {
+        if (!$config['min_keep_alive'] || $config['min_keep_alive'] <= $min * 60) {
+          $label = rcube_label(array('name' => 'everynminutes', 'vars' => array('n' => $min)));
+          $select_keep_alive->add($label, $min);
+        }
+      }
+
+      $blocks['main']['options']['keep_alive'] = array(
+        'title' => html::label($field_id, Q(rcube_label('refreshinterval'))),
+        'content' => $select_keep_alive->show($config['keep_alive']/60),
+      );
+    }
+
     // show drop-down for available skins
     if (!isset($no_override['skin'])) {
       $skins = rcmail_get_skins();
@@ -370,23 +388,6 @@ function rcmail_user_prefs($current=null)
         'content' => $input_pagesize->show($size ? $size : 50),
       );
     }
-
-    if (!isset($no_override['keep_alive'])) {
-      $field_id = 'rcmfd_keep_alive';
-      $select_keep_alive = new html_select(array('name' => '_keep_alive', 'id' => $field_id));
-
-      foreach(array(1, 3, 5, 10, 15, 30, 60) as $min)
-        if((!$config['min_keep_alive'] || $config['min_keep_alive'] <= $min * 60)
-            && (!$config['session_lifetime'] || $config['session_lifetime'] > $min)) {
-          $select_keep_alive->add(rcube_label(array('name' => 'everynminutes', 'vars' => array('n' => $min))), $min);
-        }
-
-      $blocks['new_message']['options']['keep_alive'] = array(
-        'title' => html::label($field_id, Q(rcube_label('keepalive'))),
-        'content' => $select_keep_alive->show($config['keep_alive']/60),
-      );
-    }
-
     if (!isset($no_override['check_all_folders'])) {
       $field_id = 'rcmfd_check_all_folders';
       $input_check_all = new html_checkbox(array('name' => '_check_all_folders', 'id' => $field_id, 'value' => 1));

program/steps/settings/save_prefs.inc

@@ -33,6 +33,7 @@ switch ($CURR_SECTION)
       'date_format'  => isset($_POST['_date_format']) ? get_input_value('_date_format', RCUBE_INPUT_POST) : $CONFIG['date_format'],
       'time_format'  => isset($_POST['_time_format']) ? get_input_value('_time_format', RCUBE_INPUT_POST) : ($CONFIG['time_format'] ? $CONFIG['time_format'] : 'H:i'),
       'prettydate'   => isset($_POST['_pretty_date']) ? TRUE : FALSE,
+      'keep_alive'   => isset($_POST['_keep_alive']) ? intval($_POST['_keep_alive'])*60 : $CONFIG['keep_alive'],
       'skin'         => isset($_POST['_skin']) ? get_input_value('_skin', RCUBE_INPUT_POST) : $CONFIG['skin'],
     );
 
@@ -50,7 +51,6 @@ switch ($CURR_SECTION)
       'preview_pane_mark_read' => isset($_POST['_preview_pane_mark_read']) ? intval($_POST['_preview_pane_mark_read']) : $CONFIG['preview_pane_mark_read'],
       'autoexpand_threads'   => isset($_POST['_autoexpand_threads']) ? intval($_POST['_autoexpand_threads']) : 0,
       'mdn_requests'         => isset($_POST['_mdn_requests']) ? intval($_POST['_mdn_requests']) : 0,
-      'keep_alive'           => isset($_POST['_keep_alive']) ? intval($_POST['_keep_alive'])*60 : $CONFIG['keep_alive'],
       'check_all_folders'    => isset($_POST['_check_all_folders']) ? TRUE : FALSE,
       'mail_pagesize'        => is_numeric($_POST['_mail_pagesize']) ? max(2, intval($_POST['_mail_pagesize'])) : $CONFIG['mail_pagesize'],
     );
@@ -157,15 +157,15 @@ switch ($CURR_SECTION)
 
     $a_user_prefs['timezone'] = (string) $a_user_prefs['timezone'];
 
+    if (isset($a_user_prefs['keep_alive']) && !empty($CONFIG['min_keep_alive'])) {
+      if ($a_user_prefs['keep_alive'] > $CONFIG['min_keep_alive']) {
+        $a_user_prefs['keep_alive'] = $CONFIG['min_keep_alive'];
+      }
+    }
+
     break;
-  case 'mailbox':
 
-    // force keep_alive
-    if (isset($a_user_prefs['keep_alive'])) {
-      $a_user_prefs['keep_alive'] = max(60, $CONFIG['min_keep_alive'], $a_user_prefs['keep_alive']);
-      if (!empty($CONFIG['session_lifetime']))
-        $a_user_prefs['keep_alive'] = min($CONFIG['session_lifetime']*60, $a_user_prefs['keep_alive']);
-    }
+  case 'mailbox':
 
     // force min size
     if ($a_user_prefs['mail_pagesize'] < 1)
@@ -175,6 +175,7 @@ switch ($CURR_SECTION)
       $a_user_prefs['mail_pagesize'] = (int) $CONFIG['max_pagesize'];
 
     break;
+
   case 'addressbook':
 
     // force min size
@@ -185,6 +186,7 @@ switch ($CURR_SECTION)
       $a_user_prefs['addressbook_pagesize'] = (int) $CONFIG['max_pagesize'];
 
     break;
+
   case 'folders':
 
     // special handling for 'default_folders'