Compute client-side domains on x2many fields correctly

Compute client-side domains on x2many fields correctly


When using attrs="...", evaluation of x2many fields nearly always goes wrong in ways not to be expected when being used to server side domains in Model.search().

This addon fixes those cases while keeping backwards compatibility for cases where you might have checks in a somewhat hacky way, ie. attrs="{'invisible': [('category_id', '=', [[6, False, []]])]}".