tl;dr: emacs creates a bold version of the nerd icons whenever bold is requested as a face attribute. This is undesirable because the resulting icon may be too wide and also because it just looks bad.
But unless upstream does something about it, I don't think there's a lot that can be done here:
Set :weight 'regular in all faces here. This won't hurt, but it solves only part of the problem (see my comments in the emacs bug).
Include the fontconfig snippet in the README. That also won't hurt, but it only works on platforms with fontconfig, and the user needs to do it manually.
Alternatively, this package could also install a patched font that claims to be bold but is just the regular variant. That's a bit ugly. But at least it would just solve the problem.
I'd like to raise your awareness to https://debbugs.gnu.org/cgi/bugreport.cgi?bug=67810, which I have reported to emacs.
tl;dr: emacs creates a bold version of the nerd icons whenever bold is requested as a face attribute. This is undesirable because the resulting icon may be too wide and also because it just looks bad.
But unless upstream does something about it, I don't think there's a lot that can be done here:
:weight 'regularin all faces here. This won't hurt, but it solves only part of the problem (see my comments in the emacs bug).Alternatively, this package could also install a patched font that claims to be bold but is just the regular variant. That's a bit ugly. But at least it would just solve the problem.