Paste button in TextField’s context menu is always greyed out

[Olivier Tilloy]

I can easily and reliably observe the issue with this simple QML scene:

import QtQuick 2.4
import Ubuntu.Components 1.3
Item {
  width: 400
  height: 100
  TextField {
    anchors.centerIn: parent
  }
}

Text can be pasted into the text field with the Ctrl+V keyboard shortcut, but the paste option in the context menu is always greyed out.

This is on up-to-date zesty running unity7, the version of qml-module-ubuntu-components is 1.3.2184+17.04.20170306.