init more (all?) member variables

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21564 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/window.cpp

@@ -2450,8 +2450,10 @@ void wxWindowGTK::Init()
 
     m_hAdjust = (GtkAdjustment*) NULL;
     m_vAdjust = (GtkAdjustment*) NULL;
-    m_oldHorizontalPos = 0.0;
+    m_oldHorizontalPos =
     m_oldVerticalPos = 0.0;
+    m_oldClientWidth =
+    m_oldClientHeight = 0;
 
     m_resizing = FALSE;
     m_widgetStyle = (GtkStyle*) NULL;