Command string still visible after executing command that echoes back

[nkakouros]

To reproduce, just type :set conceallevel?. You will get back what is shown in the image below:

The l? characters are leftovers from the :set conceallevel? command.

[Sam-programs]

Upstream issue: neovim/neovim#28593

[Sam-programs]

I am honestly not sure how to fix this in neovim itself. So, I am patching it by clearing the command line for the "set" command in the plugin for now. 37e8265

If you have any other commands that don't fully clear the command line when rendering, feel free to mention them here and I will add them or open a pr.