Correct wxTimer bug in wxGTK.

Correct SetSize bug for certain Toplevel windows in wxMAC.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@12696 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/timer.cpp

@@ -61,6 +61,9 @@ bool wxTimer::Start( int millisecs, bool oneShot )
 {
     (void)wxTimerBase::Start(millisecs, oneShot);
 
+    if (m_tag != -1)
+        gtk_timeout_remove( m_tag );
+
     m_tag = gtk_timeout_add( m_milli, timeout_callback, this );
 
     return TRUE;