Don't use wxRendererNative::DrawFocusRect() under Mac.

This function doesn't do the right thing there, it draws the focus border as
it's drawn around controls such as buttons. This border overflows the item
rectangle and results in garbage remaining on screen when selection changes.

See #12229.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64966 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/listctrl.cpp

@@ -2114,6 +2114,10 @@ void wxListMainWindow::OnPaint( wxPaintEvent &WXUNUSED(event) )
         }
     }
 
+    // DrawFocusRect() is unusable under Mac, it draws outside of the highlight
+    // rectangle somehow and so leaves traces when the item is not selected any
+    // more, see #12229.
+#ifndef __WXMAC__
     if ( HasCurrent() )
     {
         int flags = 0;
@@ -2123,6 +2127,7 @@ void wxListMainWindow::OnPaint( wxPaintEvent &WXUNUSED(event) )
         wxRendererNative::Get().
             DrawFocusRect(this, dc, GetLineHighlightRect(m_current), flags);
     }
+#endif // !__WXMAC__
 }
 
 void wxListMainWindow::HighlightAll( bool on )