Problem: Conceal does not work properly with 'linebreak'. (cs86661) Solution: Save and restore boguscols. (Christian Brabandt) https://github.com/vim/vim/commit/v7-4-587
Problem: Conceal does not work properly with 'linebreak'. (cs86661) Solution: Save and restore boguscols. (Christian Brabandt) https://github.com/vim/vim/commit/v7-4-587