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I think the only way to really fix this issue is to introduce 
filtering of items by not-matching criteria. That is, we'd have 
one list of queries that match creator=uid (for your editable 
queries) and then another list that match 
creator=!uid,private_for=None (for other's queries that are 
public that you may include in your list). 
 
This is a feature change, and won't be added to 0.7 this late 
in 0.7's life.