Restore automatic scrolling on wizard dialog

The scrolls are disable to compute the best size but if the result is too big,
we must allow user to scroll.

issue9494
review294221002

tryton/gui/window/wizard.py

@@ -354,6 +354,11 @@ class WizardDialog(Wizard, NoModal):
             current_view.scroll.set_policy(
                 Gtk.PolicyType.NEVER, Gtk.PolicyType.NEVER)
         self.show()
+        self.scrolledwindow.set_policy(
+            Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC)
+        if current_view.scroll:
+            current_view.scroll.set_policy(
+                Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC)
 
     def destroy(self, action=None):
         super(WizardDialog, self).destroy(action=action)