[LyX/master] Amend 63be456c8

[Guillaume Munch]

commit b034389e6def020d5201d59f6bab901453c3b5af
Author: Guillaume Munch <g...@lyx.org>
Date:   Fri Mar 10 22:55:33 2017 +0100

    Amend 63be456c8
    
    Fix crash when clicking on math previews
---
 src/Cursor.cpp |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/src/Cursor.cpp b/src/Cursor.cpp
index 2de42ba..758cef9 100644
--- a/src/Cursor.cpp
+++ b/src/Cursor.cpp
@@ -2443,6 +2443,8 @@ void Cursor::moveToClosestEdge(int const x, bool const 
edit)
                if (edit && (inset->hasSettings() || 
!inset->contextMenuName().empty()))
                        return;
                CoordCache::Insets const & insetCache = 
bv().coordCache().getInsets();
+               if (!insetCache.has(inset))
+                       return;
                int const wid = insetCache.dim(inset).wid;
                Point p = insetCache.xy(inset);
                if (x > p.x_ + (wid + 1) / 2)