Accept tags consisting of only two letters, too.

controllers/ProvideAutoSuggest.php

@@ -29,7 +29,7 @@ class ProvideAutoSuggest extends JSONController
 		{
 			$data = array_unique(explode(' ', urldecode($_REQUEST['data'])));
 			$data = array_filter($data, function($item) {
-				return strlen($item) >= 3;
+				return strlen($item) >= 2;
 			});
 
 			$this->payload = ['items' => []];

public/js/autosuggest.js

@@ -69,7 +69,7 @@ AutoSuggest.prototype.onType = function(input, event) {
     }
 
     var tokens = input.value.split(/\s+/).filter(function(token) {
-        return token.length >= 3;
+        return token.length >= 2;
     });
 
     if (tokens.length === 0) {