Rescan download directory when restoring downloads (#1372)

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

@@ -834,6 +834,10 @@ var downloadLocation = with(Settings) {
         field = value
     }
 
+fun invalidateDownloadDirCache() {
+    downloadLocation = downloadLocation.uri.asUniFile()
+}
+
 val DownloadInfo.downloadDir get() = dirname?.let { downloadLocation.findFile(it) }
 val DownloadInfo.archiveFile get() = downloadDir?.run { findFile("$gid.cbz") ?: findFile("$gid.zip") }
 val GalleryInfo.tempDownloadDir get() = AppConfig.getTempDir("$gid")?.asUniFile()

app/src/main/kotlin/com/hippo/ehviewer/ui/settings/DownloadScreen.kt

@@ -37,6 +37,7 @@ import com.hippo.ehviewer.dao.DownloadInfo
 import com.hippo.ehviewer.download.DownloadManager
 import com.hippo.ehviewer.download.downloadDir
 import com.hippo.ehviewer.download.downloadLocation
+import com.hippo.ehviewer.download.invalidateDownloadDirCache
 import com.hippo.ehviewer.spider.COMIC_INFO_FILE
 import com.hippo.ehviewer.spider.SpiderDen
 import com.hippo.ehviewer.spider.SpiderQueen.Companion.SPIDER_INFO_FILENAME
@@ -215,6 +216,8 @@ fun DownloadScreen(navigator: DestinationsNavigator) = composing(navigator) {
                     }.getOrNull()
                 }
                 runSuspendCatching {
+                    // Rescan download directory for new files added by the user
+                    invalidateDownloadDirCache()
                     val result = downloadLocation.listFiles().parMapNotNull { getRestoreItem(it) }.also {
                         fillGalleryListByApi(it, EhUrl.referer)
                     }