Re-tweak command name completion behaviour
Re-tweak command name completion behaviour

It turns out the fix for #4061 was breaking auto-selection with
space of command names.

danr/kakoune,Somasis/kakoune,Somasis/kakoune,alexherbo2/kakoune,Somasis/kakoune,mawww/kakoune,jkonecny12/kakoune,alexherbo2/kakoune,mawww/kakoune,danr/kakoune,casimir/kakoune,alexherbo2/kakoune,lenormf/kakoune,jkonecny12/kakoune,lenormf/kakoune,alexherbo2/kakoune,Somasis/kakoune,lenormf/kakoune,mawww/kakoune,casimir/kakoune,casimir/kakoune,lenormf/kakoune,danr/kakoune,danr/kakoune,jkonecny12/kakoune,casimir/kakoune,mawww/kakoune,jkonecny12/kakoune