bug#45824: 27.1; term/screen.el not loaded when TERM=screen.xterm-256color

[Eli Zaretskii <eliz@gnu.org>]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Tue, 19 Jan 2021 16:56:27 +0100
> Cc: 45824@debbugs.gnu.org
> 
> Hm...  but wouldn't that possibly cause problems?  That is, if your TERM
> is 
> 
> linux2.6.26
> 
> then if we split on dots, then Emacs will first look for
> "text/linux2.6.26.el", and then "term/linux2.6.el"...  and those are
> indeed different terminfos as found on my system:
> 
> linux2.6
> linux2.6.26
> 
> > The command I used to list all the relevant terminfo files was:
> > find /lib/terminfo /usr/share/terminfo -name '*.*' -type f -exec
> > basename '{}' ';' | sort -u
> 
> Now, there is no term/linux2.6.el, so perhaps this is irrelevant...  And
> perhaps if there was a term/linux2.6.el, perhaps loading that would be
> OK in this case?  Anybody got an opinion here?

Maybe we should just introduce a way for users to specify the terminal
type that would override the value of TERM in the environment?  Some
defcustom that could be set in the init file?  That way, we don't need
to worry about inventing a new rule, with all the unintended
consequences that could bring us.