Anvil event listeners don't handle focus properly

Anvil version: `0.4.0`

Trying to set a listener for `onFocusChange` or `onTextChanged` on an `EditText` via Anvil does not work properly. Each time the listener gets called the `EditText` loses focus, even with an empty handler body.

This has been isolated to an Anvil issue, as my workaround to manually set the listener via `Anvil.currentView().onFocusChangeListener = MyChangeListener()` works fine.

This is reproducible on multiple versions of Android on both physical and virtual devices.