Mark Color::AsRGBHexString() as const

Change-Id: Idf00e228c480afe2bbbb64682ed01f2c778b6d9d

include/tools/color.hxx

@@ -164,7 +164,7 @@ public:
 
     // Return color as RGB hex string
     // for example "00ff00" for green color
-    OUString AsRGBHexString();
+    OUString AsRGBHexString() const;
 
     // get ::basegfx::BColor from this color
     ::basegfx::BColor getBColor() const { return ::basegfx::BColor(GetRed() / 255.0, GetGreen() / 255.0, GetBlue() / 255.0); }

sw/source/core/text/xmldump.cxx

@@ -440,7 +440,7 @@ void SwFont::dumpAsXml(xmlTextWriterPtr writer) const
 {
     xmlTextWriterStartElement(writer, BAD_CAST("pFont"));
     xmlTextWriterWriteFormatAttribute(writer, BAD_CAST("ptr"), "%p", this);
-    xmlTextWriterWriteFormatAttribute(writer, BAD_CAST("color"), "%s", const_cast<Color&>(GetColor()).AsRGBHexString().toUtf8().getStr());
+    xmlTextWriterWriteFormatAttribute(writer, BAD_CAST("color"), "%s", GetColor().AsRGBHexString().toUtf8().getStr());
     xmlTextWriterEndElement(writer);
 }
 

tools/source/generic/color.cxx

@@ -232,7 +232,7 @@ SvStream& Color::Write( SvStream& rOStm, bool bNewFormat )
     return rOStm;
 }
 
-OUString Color::AsRGBHexString()
+OUString Color::AsRGBHexString() const
 {
     std::stringstream ss;
     ss << std::hex << std::setfill ('0') << std::setw(6) << GetRGBColor();