bug#28339: 25.2; Emacs shows ZWNJ character (Zero Width non-Joiner) as Space

[Eli Zaretskii]

> Date: Sun, 03 Sep 2017 20:06:33 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 28339@debbugs.gnu.org
> 
> Emacs traditionally tries not to hide characters from the user.

Maybe there's a misunderstanding on my part: are you saying that you
do NOT see ZWNJ on display?  In that case, it could be because the
character is by default displayed as a very thin (1-pixel) space.
When you move the cursor across it, you should see a very thin bar
instead of the normal cursor.

In any case, the variable I mentioned lets you change how this
character is displayed.