When a user goes to [[Special:Log]], and starts to type characters into the "Performer" input field, an "Autocomplete" search occurs where usernames that begin with the characters entered are suggested. For instance, if I type in "Lanki" it suggests ten usernames that start with those five characters.

Unfortunately, this is also matching abusive usernames that have been hidden with the suppression user tool. As these usernames are often offensive or libelous, the search should omit any usernames that have been blocked *and* suppressed.