Without scheduling, lots of vim state will be related to the builtin
picker when the new picker is opened despite closing the builtin picker
first and then opening a new picker.
This impacts state like `vim.fn.mode()`. If the builtin picker was
closed in insert mode, the closing action _should_ put you back in
normal mode. But without scheduling, the next picker is opened before it
does. So doing `vim.fn.mode()` in the subsequent picker will tell you,
you're still in insert mode. Typically, when chaining pickers, you want
the pre-telescope state, making the transitions between pickers
seemless.
47ab113de5