[LyX/master] Removed unused private variable

[Jean-Marc Lasgouttes]

commit c4075367fa6330cac075e94b61f8522fcd54f630
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Mon May 14 23:03:50 2018 +0200

    Removed unused private variable
    
    Spotted by clang++ 6.
---
 src/mathed/InsetMathColor.cpp |    4 ++--
 src/mathed/InsetMathColor.h   |    2 --
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/mathed/InsetMathColor.cpp b/src/mathed/InsetMathColor.cpp
index 6cb9960..d665734 100644
--- a/src/mathed/InsetMathColor.cpp
+++ b/src/mathed/InsetMathColor.cpp
@@ -29,14 +29,14 @@ using namespace lyx::support;
 namespace lyx {
 
 InsetMathColor::InsetMathColor(Buffer * buf, bool oldstyle, ColorCode color)
-       : InsetMathNest(buf, 1), w_(0), oldstyle_(oldstyle),
+       : InsetMathNest(buf, 1), oldstyle_(oldstyle),
          color_(from_utf8(lcolor.getLaTeXName(color)))
 {}
 
 
 InsetMathColor::InsetMathColor(Buffer * buf, bool oldstyle,
                docstring const & color)
-       : InsetMathNest(buf, 1), w_(0), oldstyle_(oldstyle), color_(color)
+       : InsetMathNest(buf, 1), oldstyle_(oldstyle), color_(color)
 {}
 
 
diff --git a/src/mathed/InsetMathColor.h b/src/mathed/InsetMathColor.h
index 829c465..08495b3 100644
--- a/src/mathed/InsetMathColor.h
+++ b/src/mathed/InsetMathColor.h
@@ -49,8 +49,6 @@ public:
        InsetCode lyxCode() const { return MATH_COLOR_CODE; }
 private:
        virtual Inset * clone() const;
-       /// width of '[' in current font
-       mutable int w_;
        ///
        bool oldstyle_;
        /// Our color. Only valid LaTeX colors are allowed.