import { winfixheight } from "https://deno.land/x/denops_std@v3.11.3/option/mod.ts";
Keep the window height when windows are opened or closed and 'equalalways' is set. Also for |CTRL-W_=|. Set by default for the |preview-window| and |quickfix-window|. The height may be changed anyway when running out of room.