Fixed HTML escaping issues in the function argument widget

HTML escaping was moved out of the TypePrettyPrinter since it interferes
with other logic there. Instead, the region to mark is now available
from the Overview and used by the FunctionArgumentWidget to put the
current argument in bold.

src/libs/cplusplus/Overview.h

@@ -44,9 +44,6 @@ public:
     Overview();
     ~Overview();
 
-    bool richText() const;
-    void setRichText(bool richText);
-
     bool showArgumentNames() const;
     void setShowArgumentNames(bool showArgumentNames);
 
@@ -59,10 +56,15 @@ public:
     bool showFullyQualifiedNames() const;
     void setShowFullyQualifiedNamed(bool showFullyQualifiedNames);
 
-    // 1-based
-    // ### rename
-    unsigned markArgument() const;
-    void setMarkArgument(unsigned position);
+    // argument index that you want to mark
+    unsigned markedArgument() const;
+    void setMarkedArgument(unsigned position);
+
+    int markedArgumentBegin() const;
+    void setMarkedArgumentBegin(int begin);
+
+    int markedArgumentEnd() const;
+    void setMarkedArgumentEnd(int end);
 
     QString operator()(Name *name) const
     { return prettyName(name); }
@@ -75,12 +77,13 @@ public:
     QString prettyType(const FullySpecifiedType &type, const QString &name) const;
 
 private:
-    unsigned _markArgument;
+    unsigned _markedArgument;
+    int _markedArgumentBegin;
+    int _markedArgumentEnd;
     bool _showArgumentNames: 1;
     bool _showReturnTypes: 1;
     bool _showFunctionSignatures: 1;
     bool _showFullyQualifiedNames: 1;
-    bool _richText: 1;
 };
 
 } // end of namespace CPlusPlus