Setup script on disabling icons.filetype.enabled

[rhodes-b]

Preamble (you can delete this section):

• Are you using a recent build (november 2020 & up) of neovim 0.5?
• Do you certify having read the readme or are ready for being shamed for not having read the manual?

Description

If you want to disable the file icons it does not work if you place it inside of after/barbar.lua it will show the error.
If you place the setup inside of init.lua then it works properly

To Reproduce

dont install the file icons plugin and try to do setup in after like the typical plugin setup

Informations
Neovim version: 0.11.0-nightly+85295f

[rhodes-b]

I did some more testing it should be noted that vim.g.barbar_auto_setup = false needs to go into init.lua while the rest of the setup can go into after/barbar.lua

Maybe this is obvious but I am pretty new to neovim and this is not pointed out, I can open a PR for this in the README

Anyways very nice plugin thanks for your work!

[Iron-E]

This is something we are fixing in v2 (see #394).

See :h initialization but specifically :h load-plugins for the reason why barbar_auto_setup needs to be assigned outside of after 🙂