Make "auto" the default theme choice.

Author: caarmen

Diff for: app/src/androidTest/java/ca/rmen/android/poetassistant/main/IntegrationTest.java

@@ -213,7 +213,7 @@ public void copyCleanLayoutTest() {
     public void themeTest() {
         openMenuItem(R.string.action_settings);
         clickPreference(R.string.pref_theme_title);
-        onView(withText(R.string.pref_theme_value_light)).check(matches(isChecked()));
+        onView(withText(R.string.pref_theme_value_auto)).check(matches(isChecked()));
         onView(withText(R.string.pref_theme_value_dark)).perform(click());
         pressBack();
 

Diff for: app/src/androidTest/java/ca/rmen/android/poetassistant/main/TaskStackTest.java

@@ -87,7 +87,7 @@ private void deepLinkAfterThemeChangeTest(String deepLinkUrl) {
         Intent intent = new Intent();
         mActivityTestRule.launchActivity(intent);
         clickPreference(R.string.pref_theme_title);
-        onView(withText(R.string.pref_theme_value_light)).check(matches(isChecked()));
+        onView(withText(R.string.pref_theme_value_auto)).check(matches(isChecked()));
         onView(withText(R.string.pref_theme_value_dark)).perform(click());
 
         // Open a deep link

Diff for: app/src/main/kotlin/ca/rmen/android/poetassistant/settings/SettingsPrefs.kt

@@ -129,7 +129,7 @@ class SettingsPrefs(application: Application) {
 
     var theme: String
         get() {
-            return sharedPreferences.getString(PREF_THEME, THEME_LIGHT) ?: THEME_LIGHT
+            return sharedPreferences.getString(PREF_THEME, THEME_LIGHT) ?: THEME_AUTO
         }
         set(newValue) {
             sharedPreferences.edit().putString(PREF_THEME, newValue).apply()

Diff for: app/src/main/res/xml/pref_general.xml

@@ -104,7 +104,7 @@
         android:title="@string/pref_category_ui">
 
         <ListPreference
-            android:defaultValue="Light"
+            android:defaultValue="Auto"
             android:entries="@array/pref_theme_titles"
             android:entryValues="@array/pref_theme_values"
             android:icon="@drawable/ic_settings_theme"