bug#26445: 26.0.50; Scroll margin and cursor movement working incorrectly when scrolling over different height lines

[Eli Zaretskii]

> Date: Fri, 14 Apr 2017 10:06:41 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 26445@debbugs.gnu.org, npostavs@users.sourceforge.net
> 
> > For example using prettify-symbols-mode to replace -> with ⭢ or configs 
> > for programs like
> > polybar which naturally contain a host of characters like    🔇 ⏭.
> 
> That depends on what font you have installed that's used to display
> those characters.  It is best to have fonts of approximately the same
> height.

Btw, , , and  are private-use area (PUA) characters, so I'm not
sure what you expected from Emacs to do with them.