workaround for sequent viewer flickering

diff --git a/helm/matita/matitaMathView.ml b/helm/matita/matitaMathView.ml
index 479891fec0e41a24eed945b75444f3244b58e4c9..586ff14796938f4c82b2ccd5ec6837c06f6ef2e0 100644 (file)
--- a/helm/matita/matitaMathView.ml
+++ b/helm/matita/matitaMathView.ml
@@ -432,7 +432,7 @@ class sequentsViewer ~(notebook:GPack.notebook) ~(cicMathView:cicMathView) () =
       self#script#setGoal goal;
       let win metano =
         let w =
-          GBin.scrolled_window ~hpolicy:`AUTOMATIC ~vpolicy:`AUTOMATIC
+          GBin.scrolled_window ~hpolicy:`AUTOMATIC ~vpolicy:`ALWAYS
             ~shadow_type:`IN ~show:true ()
         in
         let reparent () =