import { setcmdline } from "https://deno.land/x/denops_backport@v1.0.2/functions.ts";
Set the command line to {str} and set the cursor position to {pos}. If {pos} is omitted, the cursor is positioned after the text. Returns 0 when successful, 1 when not editing the command line.
Note that the first call is not possible in a batch block.