lose background color?
au ColorScheme * hi Normal ctermbg=none guibg=none cause lose background color?
not use Shade.nvim and au ColorScheme * hi Normal ctermbg=none guibg=none before colorscheme

use Shade.nvim and au ColorScheme * hi Normal ctermbg=none guibg=none before colorscheme
au ColorScheme * hi Normal ctermbg=none guibg=none
colorscheme xxx

change the order:
colorscheme xxx
au ColorScheme * hi Normal ctermbg=none guibg=none

but I still want to use au ColorScheme * hi Normal ctermbg=none guibg=none before colorscheme
Can you let me know if it's fixed with https://github.com/sunjon/Shade.nvim/commit/0507aa26c0d33f75ed68bc38c1800ffb8d634200 please.
@sunjon
I update this issue , seems now problem is au ColorScheme * hi Normal ctermbg=none guibg=none
@sunjon
I update this issue , seems now problem is
au ColorScheme * hi Normal ctermbg=none guibg=none
Ah, you've got a transparent bg? I think what's happening is that it's trying to blend 'none' with 'none'.
There's a config key debug=true that sets an actual colour to blend with. Could you try that and report back how it's looks please?
@sunjon
debug=true
au ColorScheme * hi Normal ctermbg=none guibg=none
colorscheme xxx
vsplit get this:
20:10:34 [shade:428] : AutoCmd: WinEnter : 1003 nil
20:10:34 [shade:273] : WinEnter 1003
20:10:34 [shade:203] : create overlay [1003] : overlay 1004 created
20:10:34 [shade:167] : unshade_window [1003] : overlay 1004 OFF (winblend: 100 [disabled])
20:10:34 [shade:180] : deactivating window 1000
20:10:34 [shade:156] : shade_window [1000] : overlay 1002 ON (winblend: 50)

debug=true
colorscheme xxx
au ColorScheme * hi Normal ctermbg=none guibg=none
vsplit get this:
20:14:51 [shade:428] : AutoCmd: WinEnter : 1003 nil
20:14:51 [shade:273] : WinEnter 1003
20:14:51 [shade:203] : create overlay [1003] : overlay 1004 created
20:14:51 [shade:167] : unshade_window [1003] : overlay 1004 OFF (winblend: 100 [disabled])
20:14:51 [shade:180] : deactivating window 1000
20:14:51 [shade:156] : shade_window [1000] : overlay 1002 ON (winblend: 50)

alright. So it shades fine like that. So if I make it a user configurable color and default it to 'None', everything should be fine.
Just FYI that it popped up when using meterial-nvim. Ref: https://github.com/marko-cerovac/material.nvim/issues/40
Perhaps a possible solution could be something like what other users are doing for twilight.nvim