undo leaves concealer artifact

[champignoom]

Prerequisites

• I am using the latest stable release of Neovim
• I am using the latest version of the plugin

Neovim Version

v0.9.0

Neorg setup

require('neorg').setup {
	load = {
		["core.defaults"] = {}, -- Loads default behaviour
		["core.norg.concealer"] = {}, -- Adds pretty icons to your documents
		["core.norg.dirman"] = { -- Manages Neorg workspaces
			config = {
				workspaces = {
					notes = "~/notes",
				},
			},
		},
	},
}

Actual behavior

◉

One header1 icon remains.

Expected behavior

Buffer should become empty.

Steps to reproduce

type * a<Esc>u

Potentially conflicting plugins

No response

Other information

Similar to #831,, this problem doesn't exist prior to 3009adf.

Help

Yes

Implementation help

No response

[vhyrro]

This will be a very difficult problem to solve because nvim_buf_attach does not properly report undo operations, and this is a known issue without a real expected fix on the Neovim side iirc as it would require a large refactor in the codebase :|