Fix settings ui

app/src/main/java/org/koitharu/kotatsu/settings/MainSettingsFragment.kt

@@ -6,7 +6,6 @@ import android.os.Bundle
 import android.view.View
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.preference.*
-import com.google.android.material.color.DynamicColors
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BasePreferenceFragment
 import org.koitharu.kotatsu.base.ui.dialog.StorageSelectDialog
@@ -39,6 +38,8 @@ class MainSettingsFragment : BasePreferenceFragment(R.string.settings),
 			entryValues = ListMode.values().names()
 			setDefaultValueCompat(ListMode.GRID.name)
 		}
+		findPreference<SwitchPreference>(AppSettings.KEY_DYNAMIC_THEME)?.isVisible =
+			DeviceUtil.isDynamicColorAvailable
 		findPreference<ListPreference>(AppSettings.KEY_DATE_FORMAT)?.run {
 			entryValues = arrayOf("", "MM/dd/yy", "dd/MM/yy", "yyyy-MM-dd", "dd MMM yyyy", "MMM dd, yyyy")
 			val now = Date().time
@@ -57,8 +58,6 @@ class MainSettingsFragment : BasePreferenceFragment(R.string.settings),
 
 	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
 		super.onViewCreated(view, savedInstanceState)
-		findPreference<SwitchPreference>(AppSettings.KEY_DYNAMIC_THEME)?.isVisible =
-			DeviceUtil.isDynamicColorAvailable
 		findPreference<Preference>(AppSettings.KEY_LOCAL_STORAGE)?.run {
 			summary = settings.getStorageDir(context)?.getStorageName(context)
 				?: getString(R.string.not_available)

app/src/main/java/org/koitharu/kotatsu/settings/SettingsActivity.kt

@@ -8,6 +8,7 @@ import androidx.core.graphics.Insets
 import androidx.core.view.updateLayoutParams
 import androidx.core.view.updatePadding
 import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentManager
 import androidx.fragment.app.FragmentTransaction
 import androidx.fragment.app.commit
 import androidx.preference.Preference
@@ -18,7 +19,8 @@ import org.koitharu.kotatsu.core.model.MangaSource
 import org.koitharu.kotatsu.databinding.ActivitySettingsBinding
 
 class SettingsActivity : BaseActivity<ActivitySettingsBinding>(),
-	PreferenceFragmentCompat.OnPreferenceStartFragmentCallback {
+	PreferenceFragmentCompat.OnPreferenceStartFragmentCallback,
+	FragmentManager.OnBackStackChangedListener {
 
 	override fun onCreate(savedInstanceState: Bundle?) {
 		super.onCreate(savedInstanceState)
@@ -32,6 +34,20 @@ class SettingsActivity : BaseActivity<ActivitySettingsBinding>(),
 		}
 	}
 
+	override fun onStart() {
+		super.onStart()
+		supportFragmentManager.addOnBackStackChangedListener(this)
+	}
+
+	override fun onStop() {
+		supportFragmentManager.removeOnBackStackChangedListener(this)
+		super.onStop()
+	}
+
+	override fun onBackStackChanged() {
+		binding.appbar.setExpanded(true, true)
+	}
+
 	override fun onPreferenceStartFragment(
 		caller: PreferenceFragmentCompat,
 		pref: Preference