colors are only set if non-black, otherwise Enable(false) does not gray them out

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28025 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/window.cpp

@@ -886,8 +886,14 @@ void wxWindowMac::MacUpdateControlFont()
         fontStyle.just = teJustRight ;
 
     
+    // we only should do this in case of a non-standard color, as otherwise 'disabled' controls
+    // won't get grayed out by the system anymore
+    
+    if ( GetForegroundColour() != *wxBLACK )
+    {
         fontStyle.foreColor = MAC_WXCOLORREF(GetForegroundColour().GetPixel() ) ;
         fontStyle.flags |= kControlUseForeColorMask ;
+    }
 	
 	::SetControlFontStyle( *m_peer , &fontStyle );
 	Refresh() ;