bug#21207: 25.0.50; Cursor position behaves unpredictably on the 'display text property

[Eli Zaretskii]

> Date: Fri, 07 Aug 2015 18:29:10 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 21207@debbugs.gnu.org
> 
> > If I can place the cursor on the newline in the first scenario, why
> > can't I do so in the second?
> 
> Because we have special support for cursor positioning on display
> strings that end in a newline

More importantly: in the first scenario the newline ends the display
string, whereas in the second it is in its middle.  We never put the
cursor in the middle of a display string, always after it (unless
there's a 'cursor' property on some of its glyphs).