MultiEnum (function set) throws a truncation error on query

[wilr]

From http://open.silverstripe.org/ticket/8160

When using DBField 'MultiEnum?' SS translates this to MySQL set command. MSSQL doesn't have set and doesn't even have Enum, that is why mssql module translates both. Enum works correctly by search for the longest option and then setting the mssql field to varchar(). Since mssql module function set directly returns function enum there is a truncation error because varchar() is not long enough.

Example:

Enum('Apple, Oranges, Mango') => resulting field Varchar(7)
MultiEnum?('Apple, Oranges, Mango') => resulting field Varchar(7) error
I fixed this by bypassing Enum varchar length selection with a value of 255

My fix; Line 1023: $maxLength = 255;