make clear that wxFont::SetFamily() does change the font face name, too (not only on wxGTK, also in wxMSW); reorganize docs for wxFont using doxygen groups; mention that GetFamily() is not very useful and returns a lot of times wxFONTFAMILY_UNKNOWN

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@60391 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/font.cpp

@@ -641,10 +641,9 @@ void wxNativeFontInfo::SetFamily(wxFontFamily family)
 
     lf.lfPitchAndFamily = (BYTE)(DEFAULT_PITCH) | ff_family;
 
-    if ( !wxStrlen(lf.lfFaceName) )
-    {
-        SetFaceName(facename);
-    }
+    // reset the facename so that CreateFontIndirect() will automatically choose a
+    // face name based only on the font family.
+    lf.lfFaceName[0] = '\0';
 }
 
 void wxNativeFontInfo::SetEncoding(wxFontEncoding encoding)