Compose Modifier
onFocusChanged
Common
```kotlin
fun Modifier.onFocusChanged(onFocusChanged: (FocusState) -> Unit): Modifier
```
Add this modifier to a component to observe focus state events. `onFocusChanged` is invoked when
the focus state changes. The `onFocusChanged` modifier listens to the state of the first
`focusTarget` following this modifier.
Note: If you want to be notified every time the internal focus state is written to (even if it
hasn't changed), use `onFocusEvent` instead.