After adding the following to themes.xml :
<style name="Theme.App" parent="android:Theme.Material.Light.NoActionBar"/>
<style name="Theme.App.starting" parent="Theme.SplashScreen.IconBackground">
<item name="windowSplashScreenIconBackgroundColor">@color/App_launcher_background</item>
<item name="windowSplashScreenBackground">@color/black</item>
<item name="windowSplashScreenAnimatedIcon">@drawable/App_launcher_foreground</item>
<item name="postSplashScreenTheme">@style/Theme.App</item>
</style>
And using it with installSplashScreen() in the main activity, the app has now a white border when rotating the screen :
It wasn't the case when using Theme.App :
It's a Jetpack Compose App with theme defined in Theme.kt.
Any idea how to solve this issue ?
Thank you
EDIT : As a workaround, I added enableEdgeToEdge() before setContent. Of course, only a workaround, explanation still needed.