Bug 620827: Fix the bug_see_also class column length.

Bugzilla/Install/DB.pm

@@ -3548,10 +3548,15 @@ sub _migrate_user_tags {
 sub _populate_bug_see_also_class {
     my $dbh = Bugzilla->dbh;
 
-    return if $dbh->bz_column_info('bug_see_also', 'class');
+    if ($dbh->bz_column_info('bug_see_also', 'class')) {
+        # The length was incorrectly set to 64 instead of 255.
+        $dbh->bz_alter_column('bug_see_also', 'class',
+                              {TYPE => 'varchar(255)', NOTNULL => 1});
+        return;
+    }
 
     $dbh->bz_add_column('bug_see_also', 'class',
-        {TYPE => 'varchar(64)', NOTNULL => 1}, '');
+        {TYPE => 'varchar(255)', NOTNULL => 1}, '');
 
     my $result = $dbh->selectall_arrayref(
         "SELECT id, value FROM bug_see_also");