[LyX/master] In mathed, only select current cell on double-click

[Jean-Marc Lasgouttes]

commit be7e89a29b451796030839150495dd12711d7914
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Mon Mar 14 15:14:57 2016 +0100

    In mathed, only select current cell on double-click
    
    Keep the behavior of split selection with triple click.
    
    Fixes part of #9747. The remainder was fixed at f58d9f27, AFAICS.

diff --git a/src/mathed/InsetMathNest.cpp b/src/mathed/InsetMathNest.cpp
index 90007c0..493f529 100644
--- a/src/mathed/InsetMathNest.cpp
+++ b/src/mathed/InsetMathNest.cpp
@@ -735,10 +735,17 @@ void InsetMathNest::doDispatch(Cursor & cur, FuncRequest 
& cmd)
        }
 
        case LFUN_MOUSE_DOUBLE:
-       case LFUN_MOUSE_TRIPLE:
        case LFUN_WORD_SELECT:
                cur.pos() = 0;
+               cur.resetAnchor();
+               cur.setSelection(true);
+               cur.pos() = cur.lastpos();
+               cur.bv().cursor() = cur;
+               break;
+
+       case LFUN_MOUSE_TRIPLE:
                cur.idx() = 0;
+               cur.pos() = 0;
                cur.resetAnchor();
                cur.setSelection(true);
                cur.idx() = cur.lastidx();