6 files changed, 43 insertions, 17 deletions
diff --git a/program/steps/mail/folders.inc b/program/steps/mail/folders.inc
index 26f464b0c..a74e61615 100644
--- a/program/steps/mail/folders.inc
+++ b/program/steps/mail/folders.inc
@@ -53,7 +53,7 @@ else if ($RCMAIL->action=='purge')
     || preg_match($trash_regexp, $mbox) || preg_match($junk_regexp, $mbox))
   {
     $success = $IMAP->clear_mailbox($mbox);
-  
+
     if ($success && !empty($_REQUEST['_reload']))
     {
       $OUTPUT->set_env('messagecount', 0);
@@ -62,7 +62,7 @@ else if ($RCMAIL->action=='purge')
       $OUTPUT->command('set_rowcount', rcmail_get_messagecount_text());
       $OUTPUT->command('set_unread_count', $mbox, 0);
       $OUTPUT->command('set_quota', rcmail_quota_content());
-      $_SESSION['unseen_count'][$mbox] = 0;
+      rcmail_set_unseen_count($mbox, 0);
     }
     else
       $commands = "// purged: $success";
diff --git a/program/steps/mail/func.inc b/program/steps/mail/func.inc
index c7498d5b1..4803956b6 100644
--- a/program/steps/mail/func.inc
+++ b/program/steps/mail/func.inc
@@ -545,7 +545,7 @@ function rcmail_send_unread_count($mbox_name, $force=false, $count=null)
 {
   global $RCMAIL;
 
-  $old_unseen = $_SESSION['unseen_count'][$mbox_name];
+  $old_unseen = rcmail_get_unseen_count($mbox_name);
 
   if ($count === null)
     $unseen = $RCMAIL->imap->messagecount($mbox_name, 'UNSEEN', $force);
@@ -555,13 +555,33 @@ function rcmail_send_unread_count($mbox_name, $force=false, $count=null)
   if ($unseen != $old_unseen || ($mbox_name == 'INBOX'))
     $RCMAIL->output->command('set_unread_count', $mbox_name, $unseen, ($mbox_name == 'INBOX'));
 
-  // @TODO: this data is doubled (session and cache tables) if caching is enabled
-  $_SESSION['unseen_count'][$mbox_name] = $unseen;
+  rcmail_set_unseen_count($mbox_name, $unseen);
 
   return $unseen;
 }
 
 
+function rcmail_set_unseen_count($mbox_name, $count)
+{
+  // @TODO: this data is doubled (session and cache tables) if caching is enabled
+
+  // Make sure we have an array here (#1487066)
+  if (!is_array($_SESSION['unseen_count']))
+    $_SESSION['unseen_count'] = array();
+
+  $_SESSION['unseen_count'][$mbox_name] = $count;
+}
+
+
+function rcmail_get_unseen_count($mbox_name)
+{
+  if (is_array($_SESSION['unseen_count']) && array_key_exists($mbox_name, $_SESSION['unseen_count']))
+    return $_SESSION['unseen_count'][$mbox_name];
+  else
+    return null;
+}
+
+
 /**
  * Sets message is_safe flag according to 'show_images' option value
  *
diff --git a/program/steps/mail/getunread.inc b/program/steps/mail/getunread.inc
index a035f5204..e60f36cae 100644
--- a/program/steps/mail/getunread.inc
+++ b/program/steps/mail/getunread.inc
@@ -28,15 +28,18 @@ if (!empty($a_folders))
   $check_all = (bool)$RCMAIL->config->get('check_all_folders');
 
   foreach ($a_folders as $mbox_row) {
-    if (!$check_all && isset($_SESSION['unseen_count'][$mbox_row]) && $mbox_row != $current)
-      $unseen = $_SESSION['unseen_count'][$mbox_row];
+    $unseen_old = rcmail_get_unseen_count($mbox_row);
+
+    if (!$check_all && $unseen_old !== null && $mbox_row != $current)
+      $unseen = $unseen_old;
     else
-      $unseen = $IMAP->messagecount($mbox_row, 'UNSEEN', !isset($_SESSION['unseen_count'][$mbox_row]));
+      $unseen = $IMAP->messagecount($mbox_row, 'UNSEEN', $unseen_old === null);
 
-    if ($unseen || !isset($_SESSION['unseen_count'][$mbox_row])) {
+    if ($unseen || $unseen_old === null) {
       $OUTPUT->command('set_unread_count', $mbox_row, $unseen, $inbox && $mbox_row == 'INBOX');
     }
-    $_SESSION['unseen_count'][$mbox_row] = $unseen;
+
+    rcmail_set_unseen_count($mbox_row, $unseen);
   }
 }
 
diff --git a/program/steps/mail/mark.inc b/program/steps/mail/mark.inc
index 5411e3f46..65a8fc6ba 100644
--- a/program/steps/mail/mark.inc
+++ b/program/steps/mail/mark.inc
@@ -98,11 +98,11 @@ if (($uids = get_input_value('_uid', RCUBE_INPUT_POST)) && ($flag = get_input_va
       // update mailboxlist
       $mbox = $IMAP->get_mailbox_name();
       $unseen_count = $msg_count ? $IMAP->messagecount($mbox, 'UNSEEN') : 0;
-      $old_unseen = $_SESSION['unseen_count'][$mbox];
+      $old_unseen = rcmail_get_unseen_count($mbox);
 
       if ($old_unseen != $unseen_count) {
         $OUTPUT->command('set_unread_count', $mbox, $unseen_count, ($mbox == 'INBOX'));
-	    $_SESSION['unseen_count'][$mbox] = $unseen_count;
+        rcmail_set_unseen_count($mbox, $unseen_count);
       }
       $OUTPUT->command('set_rowcount', rcmail_get_messagecount_text($msg_count));
 
diff --git a/program/steps/mail/move_del.inc b/program/steps/mail/move_del.inc
index 3940b6db9..06bef0dc6 100644
--- a/program/steps/mail/move_del.inc
+++ b/program/steps/mail/move_del.inc
@@ -109,11 +109,11 @@ else
   // update mailboxlist
   $mbox = $IMAP->get_mailbox_name();
   $unseen_count = $msg_count ? $IMAP->messagecount($mbox, 'UNSEEN') : 0;
-  $old_unseen = $_SESSION['unseen_count'][$mbox];
-  
+  $old_unseen = rcmail_get_unseen_count($mbox);
+
   if ($old_unseen != $unseen_count) {
     $OUTPUT->command('set_unread_count', $mbox, $unseen_count, ($mbox == 'INBOX'));
-    $_SESSION['unseen_count'][$mbox] = $unseen_count;
+    rcmail_set_unseen_count($mbox, $unseen_count);
   }
 
   if ($RCMAIL->action=='moveto' && strlen($target)) {
diff --git a/program/steps/mail/show.inc b/program/steps/mail/show.inc
index e660207cd..45dd8e168 100644
--- a/program/steps/mail/show.inc
+++ b/program/steps/mail/show.inc
@@ -196,8 +196,11 @@ else
 if ($MESSAGE && $MESSAGE->headers && !$MESSAGE->headers->seen &&
   ($RCMAIL->action == 'show' || ($RCMAIL->action == 'preview' && intval($CONFIG['preview_pane_mark_read']) == 0)))
 {
-  if ($IMAP->set_flag($MESSAGE->uid, 'SEEN') && $_SESSION['unseen_count'][$mbox_name])
-    $_SESSION['unseen_count'][$mbox_name] -= 1;
+  if ($IMAP->set_flag($MESSAGE->uid, 'SEEN')) {
+    if ($count = rcmail_get_unseen_count($mbox_name)) {
+      rcmail_set_unseen_count($mbox_name, $count - 1);
+    }
+  }
 }
 
 exit;