[LyX/master] Fix InsetMathRef mouse behaviour (#10568)

[Guillaume Munch]

commit 7337c968b3fba6bd07f7abf5b14c2a50243f400f
Author: Guillaume Munch <g...@lyx.org>
Date:   Sat Feb 18 22:24:25 2017 +0100

    Fix InsetMathRef mouse behaviour (#10568)
    
    Fix mouse-selection behaviour.
    
    Don't open dialog when releasing if it was not a real click.
---
 src/mathed/InsetMathRef.cpp |   21 ++++++++++++++++++---
 1 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/mathed/InsetMathRef.cpp b/src/mathed/InsetMathRef.cpp
index ef08cbc..22807f1 100644
--- a/src/mathed/InsetMathRef.cpp
+++ b/src/mathed/InsetMathRef.cpp
@@ -81,6 +81,10 @@ void InsetMathRef::doDispatch(Cursor & cur, FuncRequest & 
cmd)
        }
 
        case LFUN_MOUSE_RELEASE:
+               if (cur.selection()) {
+                       cur.undispatched();
+                       break;
+               }
                if (cmd.button() == mouse_button::button3) {
                        LYXERR0("trying to goto ref '" << 
to_utf8(asString(cell(0))) << "'");
                        //FIXME: use DispatchResult argument
@@ -96,8 +100,18 @@ void InsetMathRef::doDispatch(Cursor & cur, FuncRequest & 
cmd)
                cur.undispatched();
                break;
 
-       case LFUN_MOUSE_PRESS:
-       case LFUN_MOUSE_MOTION:
+       case LFUN_MOUSE_PRESS: {
+               bool do_selection = cmd.button() == mouse_button::button1
+                       && cmd.modifier() == ShiftModifier;
+               // For some reason the cursor points inside the first cell, 
which is not
+               // active.
+               cur.leaveInset(*this);
+               cur.bv().mouseSetCursor(cur, do_selection);
+               break;
+       }
+
+       case LFUN_MOUSE_DOUBLE:
+       case LFUN_MOUSE_TRIPLE:
                // eat other mouse commands
                break;
 
@@ -117,7 +131,8 @@ bool InsetMathRef::getStatus(Cursor & cur, FuncRequest 
const & cmd,
        case LFUN_INSET_DIALOG_UPDATE:
        case LFUN_MOUSE_RELEASE:
        case LFUN_MOUSE_PRESS:
-       case LFUN_MOUSE_MOTION:
+       case LFUN_MOUSE_DOUBLE:
+       case LFUN_MOUSE_TRIPLE:
                status.setEnabled(true);
                return true;
        default: