Remove first level of Viewport and ScrolledWindow from context screen

The policy strategy did not work when the size of the screen change because
some fields become visible.

issue5422
review20891002

tryton/gui/window/view_form/screen/screen.py

@@ -101,18 +101,32 @@ class Screen(SignalEvent):
                     for widget in walk_descendants(child):
                         yield widget
 
-            for widget in walk_descendants(context_widget):
-                if isinstance(widget, gtk.ScrolledWindow):
-                    widget.set_policy(gtk.POLICY_NEVER, gtk.POLICY_NEVER)
-                elif isinstance(widget, gtk.Viewport):
-                    widget.set_shadow_type(gtk.SHADOW_NONE)
-                elif isinstance(widget, gtk.Entry):
+            for widget in reversed(list(walk_descendants(context_widget))):
+                if isinstance(widget, gtk.Entry):
                     widget.connect_after(
                         'activate', self.screen_container.activate)
                 elif isinstance(widget, gtk.CheckButton):
                     widget.connect_after(
                         'toggled', self.screen_container.activate)
 
+            def remove_bin(widget):
+                assert isinstance(widget, (gtk.ScrolledWindow, gtk.Viewport))
+                parent = widget.parent
+                parent.remove(widget)
+                child = widget.get_child()
+                while isinstance(child, (gtk.ScrolledWindow, gtk.Viewport)):
+                    child = child.get_child()
+                child.parent.remove(child)
+                parent.add(child)
+                return child
+
+            # Remove first level Viewport and ScrolledWindow to fill the Vbox
+            for widget in [
+                    self.context_screen.screen_container.viewport,
+                    self.context_screen.current_view.widget.get_children()[0],
+                    ]:
+                remove_bin(widget)
+
             self.screen_container.filter_vbox.pack_start(
                 context_widget, expand=False, fill=True)
             self.screen_container.filter_vbox.reorder_child(