[DO NOT USE] Implement DownloadScreen part 4

app/src/main/java/com/hippo/ehviewer/Settings.kt

@@ -76,7 +76,7 @@ object Settings : DataStorePreferences(null) {
     val meteredNetworkWarning by boolPref("cellular_network_warning", false)
     var appLinkVerifyTip by boolPref("app_link_verify_tip", false)
     var enabledSecurity by boolPref("enable_secure", false)
-    var mediaScan by boolPref(KEY_MEDIA_SCAN, false)
+    var mediaScan by boolPref(KEY_MEDIA_SCAN, false).observed { updateWhenKeepMediaStatusChanges() }
     var hasDefaultDownloadLabel by boolPref("has_default_download_label", false)
     var qSSaveProgress by boolPref("qs_save_progress", true)
     var saveParseErrorBody by boolPref("save_parse_error_body", true)

app/src/main/java/com/hippo/ehviewer/SettingsCollector.kt

@@ -2,6 +2,8 @@ package com.hippo.ehviewer
 
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.os.LocaleListCompat
+import com.hippo.ehviewer.ui.keepNoMediaFileStatus
+import eu.kanade.tachiyomi.util.lang.launchIO
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
@@ -19,3 +21,11 @@ fun updateWhenLocaleChanges() {
         AppCompatDelegate.setApplicationLocales(LocaleListCompat.forLanguageTags(newValue))
     }
 }
+
+fun updateWhenKeepMediaStatusChanges() {
+    collectScope.launchIO {
+        runCatching {
+            keepNoMediaFileStatus()
+        }
+    }
+}