Listener Output Length

There was a command to set/increase the listener output length. So the listener wont cut the end of lines if they are too long and something like this:

-- Syntax error
--  In line: #(1,2,3,4,5,6

wont be cuted and will appear in full length like this:

-- Syntax error
--  In line: #(1,2,3,4,5,6,7,8,9,10)

It's a single command but I can't find it anymore. Thanks for help!