nvim: show invisible spaces/tabs

src/.config/nvim/init.vim

@@ -1,5 +1,8 @@
 set tabstop=4 shiftwidth=4 noexpandtab ai nosmd ignorecase smartcase
 
+" visible whitespace
+set list listchars=tab:»\ ,trail:•,leadmultispace:\│\ \ \ ,extends:⇥,precedes:⇤
+
 " Time neovim saves to swapfile in
 " Also time neovim recognizes cursor inactivity
 set updatetime=800

src/.config/nvim/lua/theme.lua

@@ -57,6 +57,8 @@ Group.link("@type.qualifier", groups["keyword.return"])
 
 Group.new("NormalFloat", colors.noir_1, colors.noir_9, nil)
 
+Group.new("NonText", colors.noir_9, nil, nil)
+
 -- swap undercurls and underlines
 for _, v in ipairs({ "Error", "Info", "Hint", "Warn" }) do
 	local col_name = "diagnostic_" .. string.lower(v)