"set-buffer-file-coding-system" to "utf-8-auto-unix" leads to "?" in the modeline

[liar666]

Hi,

Thanks for the mode, it make Emacs a lot more user-friendly.

When I open a file, which is in "utf-8-auto-dos" (resp. "utf-8-auto-mac") I get a pretty Windows (resp. MacOS) icon in the mode-line. But when I open a file in "utf-8-auto-unix" encoding, I get a "?" in the mode-line...

This is quite strange (and a bit surprising for a software like Emacs, that is born in the Unix world!)

Even if I take any file in any encoding and change it (either by clicking the modeline icon or using set-buffer-file-coding-system and selecting "utf-8-auto-unix"), I still get "?" in the modeline...

See attached picture:

FYI, I use:
mode-icons 20200920.2031 dependency from MELPA

Also I have some fonts installed as recommended:

fonts-font-awesome/focal,focal,now 5.0.10+really4.7.0~dfsg-1 all [installed]
fonts-octicons/focal,focal,bionic,bionic,now 4.4.0-2 all [installed]
texlive-fonts-extra/focal,focal,now 2019.202000218-1 all [installed,automatic]

(last one is what I get with apt search mfizz)

Also, I've verified in /home/user/.emacs.d/elpa/mode-icons-20200920.2031/icons, I have file FontAwesome-f17c.xpm which is the Linux icon.