[Redactor] Base.php question

[KiF]

libraryXenForoBbCodeFormatterBase.php Original

                switch ($inputSize)
                {
                    case 1: $size = '9px'; break;
                    case 2: $size = '10px'; break;
                    case 3: $size = '12px'; break;
                    case 4: $size = '15px'; break;
                    case 5: $size = '18px'; break;
                    case 6: $size = '22px'; break;

                    case 7:
                    default:
                        $size = '26px';
                }

libraryXenForoBbCodeFormatterBase.php Custom

                switch ($inputSize)
                {
                    case 1: $size = '10px'; break;
                    case 2: $size = '11px'; break;
                    case 3: $size = '12px'; break;
                    case 4: $size = '13px'; break;
                    case 5: $size = '14px'; break;
                    case 6: $size = '15px'; break;

                    case 7:
                    default:
                        $size = '16px';
                }

After first save the html of the message is

<span style="font-size: 10px">Text</span>
<br>
<span style="font-size: 11px">Text</span>
<br>
<span style="font-size: 12px">Text</span>
<br>
<span style="font-size: 13px">Text</span>
<br>
<span style="font-size: 14px">Text</span>
<br>
<span style="font-size: 15px">Text</span>
<br>
<span style="font-size: 16px">Text</span>

But I just resave message and the html of the message has become

<span style="font-size: 11px">Text</span>
<br>
<span style="font-size: 11px">Text</span>
<br>
<span style="font-size: 12px">Text</span>
<br>
<span style="font-size: 13px">Text</span>
<br>
<span style="font-size: 14px">Text</span>
<br>
<span style="font-size: 13px">Text</span>
<br>
<span style="font-size: 16px">Text</span>

I guess it's not enough to edit Base.php to get what I need, isn't it?