ACG/GLState.cc: critical bugfix: update_matrices() is now also called in pop_projection_matrix()

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@5730 383ad7c9-94d9-4d36-a494-682f7c89f535

ACG/GL/GLState.cc

@@ -539,7 +539,6 @@ void GLState::update_matrices()
   backward_projection_ = inverse_modelview_;
   backward_projection_ *= inverse_projection_;
   backward_projection_ *= inverse_window2viewport_;
-
 }
 
 
@@ -784,6 +783,8 @@ void GLState::pop_projection_matrix()
   stack_projection_.pop();
   stack_inverse_projection_.pop();
 
+  update_matrices();
+
   if (updateGL_)
   {
     makeCurrent();