bug#24644: 26.0.50; Emacs 25: set-fontset-font does not take effect with some ASCII symbols

[Eli Zaretskii]

> Cc: 24644@debbugs.gnu.org
> From: Clément Pit--Claudel <clement.pit@gmail.com>
> Date: Sun, 9 Oct 2016 10:29:44 -0400
> 
> I don't understand why the original change was needed, though.  What 
> prevented users from adding the default font as the first font in their 
> fontset?  Wouldn't that have achieved exactly the same (pick the character 
> from the default font if available, and otherwise from the next one in the 
> fontset)?

The intent was for Emacs to DTRT _by_default_, without asking users to
customize their fontsets.  Doing the latter is somewhat tricky, and
besides it's considered a Good Thing for a program to behave as users
expect out of the box.