patch for exception if overview window is hidden

diff --git a/src/HYDROGUI/HYDROGUI_Overview.cxx b/src/HYDROGUI/HYDROGUI_Overview.cxx
index bc809703f433f68c82e3be656123c6c455761bbd..d236e332725cfa099f71647dfd79bca637056578 100644 (file)
--- a/src/HYDROGUI/HYDROGUI_Overview.cxx
+++ b/src/HYDROGUI/HYDROGUI_Overview.cxx
@@ -389,7 +389,7 @@ void HYDROGUI_Overview::OnTransformation()
 
 QPoint HYDROGUI_Overview::fromMain( int xp, int yp ) const
 {
-  if( !myMainView || !myViewPort )
+  if( !myMainView || !myViewPort || !myViewPort->isVisible() )
     return QPoint();
 
   const double EPS = 1E-2;