Add wxFontInfo::Style() for consistency with Weight()

This will also be useful when changing the existing code to use
wxFontInfo().

include/wx/font.h

@@ -164,6 +164,16 @@ public:
         { SetFlag(wxFONTFLAG_ITALIC, italic); return *this; }
     wxFontInfo& Slant(bool slant = true)
         { SetFlag(wxFONTFLAG_SLANT, slant); return *this; }
+    wxFontInfo& Style(wxFontStyle style)
+    {
+        if ( style == wxFONTSTYLE_ITALIC )
+            return Italic();
+
+        if ( style == wxFONTSTYLE_SLANT )
+            return Slant();
+
+        return *this;
+    }
 
     wxFontInfo& AntiAliased(bool antiAliased = true)
         { SetFlag(wxFONTFLAG_ANTIALIASED, antiAliased); return *this; }

interface/wx/font.h

@@ -398,6 +398,9 @@ public:
     /**
         Use an italic version of the font.
 
+        This is a wrapper for Style() calling it with ::wxFONTSTYLE_ITALIC
+        argument.
+
         @see ::wxFontStyle, wxFont::SetStyle()
      */
     wxFontInfo& Italic(bool italic = true);
@@ -405,10 +408,20 @@ public:
     /**
         Use a slanted version of the font.
 
+        This is a wrapper for Style() calling it with ::wxFONTSTYLE_SLANT
+        argument.
+
         @see ::wxFontStyle, wxFont::SetStyle()
      */
     wxFontInfo& Slant(bool slant = true);
 
+    /**
+        Specify the style of the font using one of wxFontStyle constants.
+
+        @since 3.1.2
+     */
+    wxFontInfo& Style(wxFontStyle style);
+
     /**
         Set anti-aliasing flag.