Steps to reproduce the issue

Implement batch untagging function in a custom component. However, the simplest way is to look into the source code. The bug is on the code line 1056 in the file \\libraries\cms\helper\tags.php. The argument(s) of the SQL clause IN should be enclosed in braces.

Expected result

Without SQL syntax error at batch untagging in a component.

Actual result

The bug leads to the error message:

1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '2' at line 3 SQL=DELETE FROM #__contentitem_tag_map WHERE `type_alias` = 'com_gfamily.domain' AND `content_item_id` = 2 AND tag_id IN 2

System information (as much as possible)

The line 1056 of the file \\libraries\cms\helper\tags.php is currently
$query->where($db->quoteName('tag_id') . ' IN ' . implode(',', $tags));

and should be
$query->where($db->quoteName('tag_id') . ' IN (' . implode(',', $tags) . ')');

Additional comments

The bug is present in the JoomlaCMS since version 3.4 (maybe sooner or since introducing tagging capabality) and persists in the version 3.5.1 as well.