import { ctxset } from "https://deno.land/x/denops_std@v6.4.0/function/nvim/mod.ts";
Sets the context at {index} from the top of the
context-stack to that represented by {context}.
{context} is a Dictionary with context data (context-dict).
If {index} is not given, it is assumed to be 0 (i.e.: top).