fix several problems in handling of the menu items with negative ids

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50033 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/frame.cpp

@@ -946,8 +946,11 @@ bool wxFrame::HandleSize(int WXUNUSED(x), int WXUNUSED(y), WXUINT id)
     return false;
 }
 
-bool wxFrame::HandleCommand(WXWORD id, WXWORD cmd, WXHWND control)
+bool wxFrame::HandleCommand(WXWORD id_, WXWORD cmd, WXHWND control)
 {
+    // sign extend to int from short before comparing with the other int ids
+    int id = (signed short)id_;
+
     if ( control )
     {
         // In case it's e.g. a toolbar.