on my object, I have a link to 'product.product' as many2one field, in my object view, I registered product_id field:

<field context="{'group_by':'categ_id','search_default_filter_to_sell':1}" name="product_id">

when i select "Search More ..." option from dropdown, the tree view will just filtered by 'search_default_filter_to_sell' and group_by filter is not activated, I tried all available group_by filters from product.product search view and no thing happen. so, is this a bug? or i did something wrong?