[LyX/master] Avoid markers for macros without arguments

[Jean-Marc Lasgouttes]

commit 1f352b390c897d583bffaad695c04b613b88a139
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Mon Jan 23 10:14:20 2017 +0100

    Avoid markers for macros without arguments
    
    An example was the \neq macro, which exhibited white markers when selecting.
---
 src/mathed/MathMacro.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/mathed/MathMacro.cpp b/src/mathed/MathMacro.cpp
index bfa841d..3502d1d 100644
--- a/src/mathed/MathMacro.cpp
+++ b/src/mathed/MathMacro.cpp
@@ -313,7 +313,7 @@ bool MathMacro::addToMathRow(MathRow & mrow, MetricsInfo & 
mi) const
        MathRow::Element e_beg(mi, MathRow::BEG_MACRO);
        e_beg.inset = this;
        e_beg.macro = this;
-       e_beg.marker = d->nesting_ == 1 ? marker() : NO_MARKER;
+       e_beg.marker = (d->nesting_ == 1 && nargs()) ? marker() : NO_MARKER;
        mrow.push_back(e_beg);
 
        d->macro_->lock();