Kupu: wrong context in code source parameters

dear developers

i wanted to fix my inline news viewer code source. the problem was that 
it gathered only the viewers in the context of the code source itself 
instead of the context of the silva document where it is embedded.

this was the original code:

parent = context.get_container()
return [(item.get_title(),item.getId()) for item in 
parent.objectValues(['Silva News Viewer', 'Silva Agenda Viewer', 'Silva 
RSS Aggregator'])]

i changed the code to the following:

model = context.REQUEST.model
parent = model.get_container()
return [(item.get_title(),item.getId()) for item in 
parent.objectValues(['Silva News Viewer', 'Silva Agenda Viewer', 'Silva 
RSS Aggregator'])]

this returns now to correct list of viewers (code source without 
parameters, only the above script).

*but* when i use the above corrected code to populate the items of a 
list field for the parameters the context is again the code source 
itself and not the document where the code source is inserted.

the workaround is to use the trusty forms editor (once again) because 
there, the list of viewers is correct!

i add this to the issue tracker because this is a real bug (and i spent 
way to much time to recognize this).

regards,
marc