Neat idea, but there doesn't seem to be any way to explicitly accept a completion candidate (tab, space, return all behave as default instead of accepting), and

Neat idea, but there doesn't seem to be any way to explicitly accept a completion candidate (tab, space, return all behave as default instead of accepting), and trying to type as in a normal textarea results in random completion candidates being accepted mid-word. Also, C-a (Control-a, i.e. mark-whole-buffer) gets stomped; the whole textarea is marked for a fraction of a second, and then the mark disappears. Not ready for prime time.