fix: don't refetch channel metadata of already subscribed channel when importing subscriptions

Author: Bnyro

app/src/main/java/com/github/libretube/repo/LocalSubscriptionsRepository.kt

@@ -30,12 +30,16 @@ class LocalSubscriptionsRepository : SubscriptionsRepository {
     }
 
     override suspend fun importSubscriptions(newChannels: List<String>) {
-        for (chunk in newChannels.chunked(CHANNEL_CHUNK_SIZE)) {
+        val subscribedChannels = getSubscriptionChannelIds()
+
+        val newFiltered = newChannels.filter { !subscribedChannels.contains(it) }
+        for (chunk in newFiltered.chunked(CHANNEL_CHUNK_SIZE)) {
             chunk.parallelMap { channelId ->
                 val channelUrl = "$YOUTUBE_FRONTEND_URL/channel/${channelId}"
                 val channelInfo = ChannelInfo.getInfo(channelUrl)
 
-                runCatching { subscribe(channelId, channelInfo.name, channelInfo.avatars.maxByOrNull { it.height }?.url, channelInfo.isVerified) }
+                val avatarUrl = channelInfo.avatars.maxByOrNull { it.height }?.url
+                subscribe(channelId, channelInfo.name, avatarUrl, channelInfo.isVerified)
             }
         }
     }

app/src/main/java/com/github/libretube/ui/preferences/BackupRestoreSettings.kt

@@ -47,7 +47,7 @@ class BackupRestoreSettings : BasePreferenceFragment() {
         }
     private val createBackupFile = registerForActivityResult(CreateDocument(FILETYPE_ANY)) { uri ->
         if (uri == null) return@registerForActivityResult
-        CoroutineScope(Dispatchers.IO).launch {
+        lifecycleScope.launch(Dispatchers.IO) {
             BackupHelper.createAdvancedBackup(requireContext(), uri, backupFile)
         }
     }
@@ -59,7 +59,7 @@ class BackupRestoreSettings : BasePreferenceFragment() {
         ActivityResultContracts.GetContent()
     ) { uri ->
         if (uri == null) return@registerForActivityResult
-        lifecycleScope.launch(Dispatchers.IO) {
+        CoroutineScope(Dispatchers.IO).launch {
             ImportHelper.importSubscriptions(requireActivity(), uri, importFormat)
         }
     }