import { getwinposy } from "https://deno.land/x/denops_std@v6.4.0/function/mod.ts";
The result is a Number, which is the Y coordinate in pixels of
the top of the GUI Vim window. Also works for an xterm (uses
a timeout of 100 msec).
The result will be -1 if the information is not available.
The value can be used with :winpos.
Parameters
denops: Denops