sometime it happened such E254 err at my v9.1.698 (linux xfce-term 
xterm-256color)

Error detected while processing ColorSchemePre Autocommands for "*":
E254: Cannot allocate color 235

```
        hi clear difftext
        hi difftext cterm=bold ctermbg=red ctermfg=235

        au colorschemepre * if has('termguicolors') | set termguicolors | endif
```

but mostly it probably cannot be simply reproduced, so just asking anyone knew 
what happened?

-- 
shane.xb.qian

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