[LyX/2.3.x] Fix DEPM at end of paragraph

[Jean-Marc Lasgouttes]

commit c44dc071a5658380a1d6bdfcb6f138b70c17d2a5
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Wed Jan 30 23:50:53 2019 +0100

    Fix DEPM at end of paragraph
    
    Remove special handling of spaces at end of paragraph. Now they are
    handled like interword spaces by both DEPM methods.
    
    Fix off-by-one error in loop when testing for end of paragraph.
    
    Part of bug #11412.
    
    (adapted from commit c00234503f9e07795723222e6095c022e45ad1dd)
---
 src/Text2.cpp |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/Text2.cpp b/src/Text2.cpp
index bcd38f4..34fe1ca 100644
--- a/src/Text2.cpp
+++ b/src/Text2.cpp
@@ -860,13 +860,13 @@ bool Text::deleteEmptyParagraphMechanism(Cursor & cur,
                       && !oldpar.isDeleted(from - 1))
                        --from;
                int to = old.pos();
-               while (to < oldpar.size() - 1
+               while (to < oldpar.size()
                       && oldpar.isLineSeparator(to)
                       && !oldpar.isDeleted(to))
                        ++to;
 
-               // If we are not at the extremity of the paragraph, keep one 
space
-               if (from != to && from > 0 && to < oldpar.size())
+               // If we are not at the start of the paragraph, keep one space
+               if (from != to && from > 0)
                        ++from;
 
                if (same_par && cur.pos() >= from && cur.pos() < to)