[LyX/master] improve left/right navigation in root inset

[Jean-Marc Lasgouttes]

commit ee9451aaf58d15e82b1e25eea13a11a6b4906cad
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Thu Nov 8 21:22:04 2018 -0800

    improve left/right navigation in root inset
    
    Now the cursor is correctly set when changing cell with xursor left/right.
---
 src/mathed/InsetMathRoot.cpp |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/mathed/InsetMathRoot.cpp b/src/mathed/InsetMathRoot.cpp
index 5659511..f4c8bf8 100644
--- a/src/mathed/InsetMathRoot.cpp
+++ b/src/mathed/InsetMathRoot.cpp
@@ -161,9 +161,9 @@ bool InsetMathRoot::idxForward(Cursor & cur) const
        // nucleus is 0 and is on the right
        if (cur.idx() == 0)
                return false;
-       else
-               cur.idx() = 0;
 
+       cur.idx() = 0;
+       cur.pos() = 0;
        return true;
 }
 
@@ -173,9 +173,9 @@ bool InsetMathRoot::idxBackward(Cursor & cur) const
        // nucleus is 0 and is on the right
        if (cur.idx() == 1)
                return false;
-       else
-               cur.idx() = 1;
 
+       cur.idx() = 1;
+       cur.pos() = cur.lastpos();
        return true;
 }