Group downloads by artist if no labels are defined

app/src/main/kotlin/com/hippo/ehviewer/EhApplication.kt

@@ -46,6 +46,7 @@ import com.hippo.ehviewer.coil.MergeInterceptor
 import com.hippo.ehviewer.dailycheck.checkDawn
 import com.hippo.ehviewer.dao.SearchDatabase
 import com.hippo.ehviewer.download.DownloadManager
+import com.hippo.ehviewer.download.DownloadsFilterMode
 import com.hippo.ehviewer.ktbuilder.diskCache
 import com.hippo.ehviewer.ktbuilder.imageLoader
 import com.hippo.ehviewer.ktor.CronetEngine
@@ -107,7 +108,12 @@ class EhApplication : Application(), SingletonImageLoader.Factory {
             launch { EhTagDatabase }
             launch { EhDB }
             dataStateFlow.value
-            launch { DownloadManager.readMetadataFromLocal() }
+            launch {
+                if (DownloadManager.labelList.isNotEmpty() && Settings.downloadFilterMode.key !in Settings.prefs) {
+                    Settings.downloadFilterMode.value = DownloadsFilterMode.CUSTOM.flag
+                }
+                DownloadManager.readMetadataFromLocal()
+            }
             launch {
                 FileUtils.cleanupDirectory(AppConfig.externalCrashDir)
                 FileUtils.cleanupDirectory(AppConfig.externalParseErrorDir)

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

@@ -111,6 +111,7 @@ object Settings : DataStorePreferences(null) {
     val listThumbSize = intPref("list_tile_size", 40)
     val languageFilter = intPref("language_filter", -1)
     val downloadSortMode = intPref("download_sort_mode", SortMode.Default.flag)
+    val downloadFilterMode = intPref("download_filter_mode", DownloadsFilterMode.Default.flag)
     val meteredNetworkWarning = boolPref("cellular_network_warning", false)
     val blackDarkTheme = boolPref("black_dark_theme", false)
     val gridView = boolPref("grid_view", false)
@@ -120,7 +121,6 @@ object Settings : DataStorePreferences(null) {
     val animateItems = boolPref("animate_items", true)
     val displayName = stringOrNullPref("display_name", null)
     val recentDownloadLabel = stringOrNullPref("recent_download_label", null)
-    val downloadFilterMode = intPref("download_filter_mode", DownloadsFilterMode.Default.flag)
 
     var downloadScheme by stringOrNullPref("image_scheme", null)
     var downloadAuthority by stringOrNullPref("image_authority", null)

app/src/main/kotlin/com/hippo/ehviewer/download/DownloadsFilterMode.kt

@@ -20,7 +20,7 @@ enum class DownloadsFilterMode(
     ;
 
     companion object {
-        val Default = CUSTOM
+        val Default = ARTIST
         fun from(flag: Int) = DownloadsFilterMode.entries[flag]
     }
 }