The use case for messaging-app is more or less the following:

model: simNames
selectedIndex: getDefaultSim()

You go to system settings, rename the sim. This will make the model
change, but the selectedIndex binding will be broken and reset to the
first one.

But maybe you are right, as hard as it is to do that in the app, it
might be still better than to rely on a default behavior of this.

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https://bugs.launchpad.net/bugs/1557707

Title:
  [Sections] selectedIndex binding is broken if the model changes

Status in Canonical System Image:
  Triaged
Status in ubuntu-ui-toolkit package in Ubuntu:
  Incomplete

Bug description:
  If I assign a default value for the selectedIndex, it is expected that
  the binding for this value will be kept until the user selects a
  different section. Changing the model should not affect that, but it
  does, as this example shows:

  import QtQuick 2.0
  import Ubuntu.Components 1.3

  MainView {
      width: 720
      height: 1280

      Page {
          id: myPage
          anchors.fill: parent
          title: "Click the page"
          header: PageHeader {
              id: pageHeader
              title: myPage.title

              extension: Sections {
                  id: pageSections

                  model: [ "one", "two", "three" ]
                  selectedIndex: 1
              }
          }
          MouseArea {
              anchors.fill: parent
              onClicked: pageSections.model = [ "first", "second", "third" ]
          }
      }
  }

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