emacs: delete error overlays when rewinding.
emacs: delete error overlays when rewinding.

fxfactorial/merlin,rgrinberg/merlin,ocaml/merlin,neojski/merlin,rgrinberg/merlin,haselwarter/merlin,rgrinberg/merlin,dra27/merlin,fxfactorial/merlin,haselwarter/merlin,the-lambda-church/merlin,dra27/merlin,chriskonstad/merlin,ocaml/merlin,chambart/merlin,chriskonstad/merlin,dra27/merlin,the-lambda-church/merlin,chambart/merlin,neojski/merlin,dra27/merlin,ocaml/merlin,the-lambda-church/merlin,neojski/merlin,haselwarter/merlin,chambart/merlin,fxfactorial/merlin,rgrinberg/merlin,haselwarter/merlin,ocaml/merlin,neojski/merlin,chambart/merlin,fxfactorial/merlin