Prevent menu items from overflowing

src/Editor/Menu.php

@@ -110,6 +110,7 @@ class Menu
             } elseif (is_null($item)) {
                 $item = str_repeat(" ", $width - 2);
             } else {
+                $item = mb_substr($item, 0, $width);
                 $item = " " . $item . str_repeat(" ", $width - 3 - $this->itemlen($item)) . "\e[40;37m";
                 $item = (($n == $this->index)?"\e[37;44m":"\e[40;37m") . $item;
             }