Dynamic tab navigation out of TextArea

[cswingle]

I'm trying to allow users to dynamically set the tab order by dynamically setting item.KeyNavigation.tab as:

function setTab(fromStr, toStr) {
  const from = getInput(fromStr);
  const to = getInput(toStr);
  from.KeyNavigation.tab = to;
}

Where getInput identifies the input field based on the user configuration file:

function getInput(inputStr) {
  let input = nulll;
  switch (inputStr) {
    case "username":
      input = userFields.usernameInput;
      break;
    ...
}

This works well for all items except TextArea, where the tab key is captured by default. I've tried a variety of solutions I've found, and all of them result in tab moving to the next field in order on the form, not according to what I'm setting KeyNavigation.tab to. This seems to be true even when I hard code KeyNavigation.tab to a field other than the next one in the order of the form.

For example, adding this to the TextArea results in tab going to the next field (third), not the field I'm specifically tell it to go to (first):

TextField {
  id: first
}

TextArea {
  id: second
  KeyNavigation.priority: KeyNavigation.BeforeItem  // this doesn't matter
  Keys.onTabPressed: {
    event.accepted = true;  // this doesn't matter
    first.forceActiveFocus();
  }
}

TextField {
  id: third
}

What I want to work is:

TextArea {
  id: second
  Keys.onTabPressed: {
    let nextItem = nextItemInFocusChain(true);
    nextItem.forceActiveFocus()
  }
}

Where I've dynamically set the next item from "second" to be "first". No matter what I've tried, tab in the TextArea is either absorbed by the TextArea, or focus moves to the next item in the dialog (three), not the item I've told it I want it to go to (first).

Ideas?

QT 5.1.15, QTQuick.Controls 2.15