Never show tree lines when there are tree buttons under OS X and GTK+

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59203 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/treectlg.cpp

@@ -1004,8 +1004,16 @@ bool wxGenericTreeCtrl::Create(wxWindow *parent,
 
     if (major < 10)
         style |= wxTR_ROW_LINES;
+        
+    if (style & wxTR_HAS_BUTTONS)
+        style |= wxTR_NO_LINES;
 #endif // __WXMAC__
 
+#ifdef __WXGTK20__
+    if (style & wxTR_HAS_BUTTONS)
+        style |= wxTR_NO_LINES;
+#endif
+
     if ( !wxControl::Create( parent, id, pos, size,
                              style|wxHSCROLL|wxVSCROLL,
                              validator,