Fixed scrolling problem where scrollbar was taken to be a valid child window

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@55010 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -145,6 +145,8 @@ wxGTK:
 
 wxMac:
 
+- Fixed a glitch where clicking on a scrollbar (but not moving the scrollbar)
+  would cause the window to scroll.
 
 2.8.8
 -----

src/generic/scrlwing.cpp

@@ -1352,6 +1352,11 @@ void wxScrollHelper::HandleOnChildFocus(wxChildFocusEvent& event)
     if ( win == m_targetWindow )
         return; // nothing to do
 
+#ifdef __WXMAC__
+    if (wxDynamicCast(win, wxScrollBar))
+        return;
+#endif
+
     // Fixing ticket: http://trac.wxwidgets.org/ticket/9563
     // When a child inside a wxControlContainer receives a focus, the
     // wxControlContainer generates an artificial wxChildFocusEvent for