Merge pull request #8565 from cketti/startup_theme_fix

<?xml version="1.0" encoding="utf-8"?>

<resources xmlns:android="http://schemas.android.com/apk/res/android">

    <style name="Theme.K9.Startup" parent="Theme2.K9.Dark">

        <item name="android:windowBackground">@android:color/black</item>

    </style>

    <style name="Theme.K9.Startup" parent="Theme2.Main.Startup" />

    <style name="Theme.K9.Light" parent="Theme2.K9.Light">

        <item name="actionModeCloseDrawable">@drawable/ic_close</item>

<?xml version="1.0" encoding="utf-8"?>

<resources xmlns:android="http://schemas.android.com/apk/res/android">

    <style name="Theme.Thunderbird.Startup" parent="Theme2.Thunderbird.Dark">

        <item name="android:windowBackground">@android:color/black</item>

    </style>

    <style name="Theme.Thunderbird.Startup" parent="Theme2.Main.Startup" />

    <style name="Theme.Thunderbird.Light" parent="Theme2.Thunderbird.Light">

        <item name="actionModeCloseDrawable">@drawable/ic_close</item>

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <style name="Theme2.Main.DayNight" parent="Theme2.Main.Dark" />

</resources>

    <style name="Theme2.Main.DayNight" parent="Theme2.Main.Light" />

    <style name="Theme2.Main.Startup" parent="Theme2.Main.Dark">

        <item name="android:windowBackground">@android:color/black</item>

    </style>

    <!--

    Android uses the theme configured in the manifest for its initial startup animation. On Android versions that don't

    support switching the system theme we have to optimize for either the light or dark theme. We chose the dark theme

    because it's often used in low light conditions and a bright flash during startup is more annoying than using a dark

    startup animation when the app is configured to use the light theme.

    On modern Android versions we override Theme2.Main.Startup to use Theme2.Main.DayNight instead. That way the startup

    animation will match the app theme if the app follows the system theme (which is the default configuration).

    See <values-v28/themes.xml>.

    -->

    <style name="Theme2.Main.Startup" parent="Theme2.Main.Dark" />

</resources>