TextField {
    text: nbtTree.data(editPopup.index, "edit")
}

However, the TextField ends up with the display role data instead. I started print debugging this (I'm using Rust, hopefully this is simple enough code to understand for C++ programmers):

fn data(&self, index: &QModelIndex, role: i32) -> QVariant {
    println!("{role}");
    // ...
}

It prints out 0, the display role, never 2, the edit role.

I didn't override roleNames, so edit name should be bound to the edit role, but just in case, I tried setting my own too:

// role_names is equivalent to roleNames in C++
fn role_names(&self) -> QHash<QHashPair_i32_QByteArray> {
    let mut role_names = QHash::default();
    role_names.insert(ItemDataRole::DisplayRole.repr, QByteArray::from("display".as_bytes()));
    role_names.insert(ItemDataRole::EditRole.repr, QByteArray::from("edit".as_bytes()));
    role_names
}

This did not change anything.

What could be the issue here?