It is a good idea to test also with a QListView...
I found that the behavior is a little different.
From QML the flags function never called. In the data function the role is just the roles I have defined with setRoleNames call.
If I use a form with QListView flags is called many times, and role is DisplayRole, and others, so I had to extend the model, to implement the displayrole also.
But from QML, the answer is always: Cannot assign to read-only property 'title'
Any other idea?
Maybe I should use the solution with calling the slots...
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