Add .nomedia file in each chapter download folder (#2199)

* Move .nomedia creation to directory fetch

* Add .nomedia file to all chapter download directories

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadProvider.kt

@@ -28,7 +28,9 @@ class DownloadProvider(private val context: Context) {
      * The root directory for downloads.
      */
     private var downloadsDir = preferences.downloadsDirectory().getOrDefault().let {
-        UniFile.fromUri(context, Uri.parse(it))
+        val dir = UniFile.fromUri(context, Uri.parse(it))
+        DiskUtil.createNoMediaFile(dir, context)
+        dir
     }
 
     init {

app/src/main/java/eu/kanade/tachiyomi/data/download/Downloader.kt

@@ -407,6 +407,8 @@ class Downloader(
         if (download.status == Download.DOWNLOADED) {
             tmpDir.renameTo(dirname)
             cache.addChapter(dirname, mangaDir, download.manga)
+
+            DiskUtil.createNoMediaFile(tmpDir, context)
         }
     }