coverity#1371325 Missing move assignment operator

Change-Id: Iebe5ec7e2cdc6743dbabdecaa7cbb1c4a04893c4
Reviewed-on: https://gerrit.libreoffice.org/28610Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

include/vcl/metric.hxx

@@ -65,6 +65,7 @@ public:
     void                SetBuiltInFontFlag(bool);
 
     FontMetric&         operator=( const FontMetric& rMetric );
+    FontMetric&         operator=( FontMetric&& rMetric );
     bool                operator==( const FontMetric& rMetric ) const;
     bool                operator!=( const FontMetric& rMetric ) const
                             { return !operator==( rMetric ); }

vcl/source/font/fontmetric.cxx

@@ -48,15 +48,17 @@ FontMetric::~FontMetric()
     mxImplMetric = nullptr;
 }
 
-FontMetric& FontMetric::operator=( const FontMetric& rFontMetric )
+FontMetric& FontMetric::operator=(const FontMetric& rFontMetric)
 {
-    Font::operator=( rFontMetric );
-
-    if( mxImplMetric != rFontMetric.mxImplMetric )
-    {
-        mxImplMetric = rFontMetric.mxImplMetric;
-    }
+    Font::operator=(rFontMetric);
+    mxImplMetric = rFontMetric.mxImplMetric;
+    return *this;
+}
 
+FontMetric& FontMetric::operator=(FontMetric&& rFontMetric)
+{
+    Font::operator=(std::move(rFontMetric));
+    mxImplMetric = std::move(rFontMetric.mxImplMetric);
     return *this;
 }