Left strip wildcard for search code only for full text operand
Product numbers often are combined as of "prefix123456" - eg "iso9023", "DIN55", "res220", "screw5x20" etc.
The present search algo would not find if I just search for the number, but I think it should. So we should use a "find any occurance of sequence within a string" algo instead.
https://discuss.tryton.org/t/search-part-of-string-found-not-whole-string/5505