Many2Many in readonly (child) windows do not behave completely like they should
Encountered on tryton 4.0 as well as 4.6:
Scenario in demo 4.6:
- Create a party category
- Open a daft sale with lines (i.e. field party is readonly)
- Open the party from the sale (i.e. F2)
- Jump into field Categories (displayed as readonly)
- Press F3
-> despite being readonly you can select from existing categories as well as create new categories and save the record (i.e. the save button is activated)
-> the changes on the party record are silently discarded
The correct user experience should be:
- On a readonly record a m2m field should only allow to display the existing records of m2m fields.
- In the same way the New and Save Button should not be displayed (or they should at least be deactivated).