fixed (?) bug 407974 (arrows not working)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9533 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/opengl/cube/cube.cpp

@@ -360,7 +360,10 @@ void TestGLCanvas::OnKeyDown( wxKeyEvent& event )
 
     unsigned long currTime = event.m_timeStamp - m_xsynct;
 
-    if (evkey != m_Key)
+    // we have to test for m_Key != 0 because otherwise the test would be
+    // always true because it is set to 0 in OnKeyUp() below - I don't know
+    // why is it like this, just fixing blindly (VZ)
+    if (evkey != m_Key && m_Key != 0)
     {
         m_Key = evkey;
         m_LastRedraw = m_StartTime = m_LastTime = currTime;