Fix bug where after "mark all folders as read" action message counters were not reset (#6307)

also fixed one PHP 7.2 warning

CHANGELOG

@@ -7,6 +7,7 @@ CHANGELOG Roundcube Webmail
 - Fix bug where some forbidden characters on Cyrus-IMAP were not prevented from use in folder names
 - Fix bug where only attachments with the same name would be ignored on zip download (#6301)
 - Fix bug where unicode contact names could have been broken/emptied or caused DB errors (#6299)
+- Fix bug where after "mark all folders as read" action message counters were not reset (#6307)
 
 RELEASE 1.3.6
 -------------

program/lib/Roundcube/rcube_imap.php

@@ -2458,7 +2458,7 @@ class rcube_imap extends rcube_storage
      * @param string  $folder     Folder name
      * @param boolean $skip_cache True to skip message cache clean up
      *
-     * @return boolean  Operation status
+     * @return boolean Operation status
      */
     public function set_flag($uids, $flag, $folder=null, $skip_cache=false)
     {

program/steps/mail/check_recent.inc

@@ -71,8 +71,7 @@ foreach ($a_mailboxes as $mbox_name) {
             array('mailbox' => $mbox_name, 'is_current' => $is_current, 'diff' => $diff));
     }
 
-    rcmail_send_unread_count($mbox_name, true, null,
-      (!$is_current && ($status & 1)) ? 'recent' : '');
+    rcmail_send_unread_count($mbox_name, true, null, (!$is_current && ($status & 1)) ? 'recent' : '');
 
     if ($status && $is_current) {
         // refresh saved search set

program/steps/mail/func.inc

@@ -768,7 +768,7 @@ function rcmail_send_unread_count($mbox_name, $force=false, $count=null, $mark='
         $unseen = $RCMAIL->storage->count($mbox_name, 'UNSEEN', $force);
     }
 
-    if ($unseen != $old_unseen || ($mbox_name == 'INBOX')) {
+    if ($unseen !== $old_unseen || ($mbox_name == 'INBOX')) {
         $RCMAIL->output->command('set_unread_count', $mbox_name, $unseen,
             ($mbox_name == 'INBOX'), $unseen && $mark ? $mark : '');
     }

program/steps/mail/mark.inc

@@ -70,7 +70,7 @@ if ($_uids && $flag) {
 
     foreach ($input as $mbox => $uids) {
         $marked += (int)$RCMAIL->storage->set_flag($uids, $flag, $mbox);
-        $count += count($uids);
+        $count  += is_array($uids) ? count($uids) : 1;
     }
 
     if (!$marked) {