Updated text is not being sent back to the InputMethodService

Steps to reproduce:
1. Build fullscreen-keyboard project and install it on some android device
2. Build qml-keyboard-app project for android and install it on the same device

3. Switch default input method to fullscreen-keyboard
4. Launch qml-keyboard-app in fullscreen mode and landscape mode
5.  press "A" to insert text

Normally what should happen, is the "A" being shown back in the `ExtractEditText` section of the keyboard - this happens when editing native android apps.

This does not happen however when performing the same operation via qml `TextEdit`.