Clear filename when clear button is pressed

When the clear button of a binary field is pressed, you
would expect the filename to be cleared too, but the
associated field remains unchanged.

issue2633
review16201002

tryton/gui/window/view_form/view/form_gtk/binary.py

@@ -129,6 +129,8 @@ class BinaryMixin(Widget):
                     fp.write(self.field.get(self.record))
 
     def clear(self, widget=None):
+        if self.filename_field:
+            self.filename_field.set_client(self.record, None)
         self.field.set_client(self.record, None)
 
 

tryton/gui/window/view_form/view/list_gtk/widget.py

@@ -501,7 +501,9 @@ class Binary(GenericText):
 
     def clear_binary(self, renderer, path):
         record, field = self._get_record_field(path)
-        field.set_client(record, False)
+        if self.filename_field:
+            self.filename_field.set_client(record, None)
+        field.set_client(record, None)
 
 
 class Image(GenericText):