Alain Knaff <Alain.Knaff@aev.etat.lu> writes:

>> There have been some scaling related fixes in the just-released
>> emacs-26, would it be possible for you to try that version?
>
> Is there a repository where I can easily get that version from into
> Ubuntu? Or else, is there a way to disable this "scaling" in dired mode?
> Apparently it seems that this is something specific that dired "does",
> for whatever reason, as it happens in no other circumstance.

The scaling is not dired-specific, itʼs inside GTK, so thereʼs nothing
you can do to dired to change it.

Emacs-26 was released about 2 hours ago, so I doubt anyone's packaged it yet.
Iʼve attached the announcement, perhaps you can build emacs from source?

Regards

Robert