I had a really bad overfull hbox in my bibliography caused by an emdash in the first line of a two line entry. The only solution to get rid of the overfull hbox was to line break the emdash to the beginning of the second line which looks ok.
The problem is that the emdash is affected by the protrusion of microtype causing one third of it going into the left margin which doesn't look good at the beginning of a line. Can I disable the protrusion locally for this point?
{\microtypesetup{protrusion=false}---}
help? – Arash Esbati Dec 30 '15 at 15:07Use of \reserved@a doesn't match its definition
– user2653422 Dec 30 '15 at 15:14