Avoid using global scope where appropriate

Also fixes the crash in tracking when an exception is thrown during a refresh.

app/src/main/java/eu/kanade/tachiyomi/data/track/anilist/AnilistApi.kt

@@ -8,8 +8,7 @@ import eu.kanade.tachiyomi.network.POST
 import eu.kanade.tachiyomi.network.await
 import eu.kanade.tachiyomi.network.jsonMime
 import eu.kanade.tachiyomi.network.parseAs
-import kotlinx.coroutines.Dispatchers
+import eu.kanade.tachiyomi.util.lang.withIOContext
-import kotlinx.coroutines.withContext
 import kotlinx.serialization.json.JsonObject
 import kotlinx.serialization.json.buildJsonObject
 import kotlinx.serialization.json.contentOrNull
@@ -30,7 +29,7 @@ class AnilistApi(val client: OkHttpClient, interceptor: AnilistInterceptor) {
     private val authClient = client.newBuilder().addInterceptor(interceptor).build()
 
     suspend fun addLibManga(track: Track): Track {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val query =
                 """
             |mutation AddManga(${'$'}mangaId: Int, ${'$'}progress: Int, ${'$'}status: MediaListStatus) {
@@ -65,7 +64,7 @@ class AnilistApi(val client: OkHttpClient, interceptor: AnilistInterceptor) {
     }
 
     suspend fun updateLibManga(track: Track): Track {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val query =
                 """
             |mutation UpdateManga(${'$'}listId: Int, ${'$'}progress: Int, ${'$'}status: MediaListStatus, ${'$'}score: Int) {
@@ -92,7 +91,7 @@ class AnilistApi(val client: OkHttpClient, interceptor: AnilistInterceptor) {
     }
 
     suspend fun search(search: String): List<TrackSearch> {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val query =
                 """
             |query Search(${'$'}query: String) {
@@ -143,7 +142,7 @@ class AnilistApi(val client: OkHttpClient, interceptor: AnilistInterceptor) {
     }
 
     suspend fun findLibManga(track: Track, userid: Int): Track? {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val query =
                 """
             |query (${'$'}id: Int!, ${'$'}manga_id: Int!) {
@@ -209,7 +208,7 @@ class AnilistApi(val client: OkHttpClient, interceptor: AnilistInterceptor) {
     }
 
     suspend fun getCurrentUser(): Pair<Int, String> {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val query =
                 """
             |query User {

app/src/main/java/eu/kanade/tachiyomi/data/track/bangumi/BangumiApi.kt

@@ -9,8 +9,7 @@ import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.POST
 import eu.kanade.tachiyomi.network.await
 import eu.kanade.tachiyomi.network.parseAs
-import kotlinx.coroutines.Dispatchers
+import eu.kanade.tachiyomi.util.lang.withIOContext
-import kotlinx.coroutines.withContext
 import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonObject
@@ -33,7 +32,7 @@ class BangumiApi(private val client: OkHttpClient, interceptor: BangumiIntercept
     private val authClient = client.newBuilder().addInterceptor(interceptor).build()
 
     suspend fun addLibManga(track: Track): Track {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val body = FormBody.Builder()
                 .add("rating", track.score.toInt().toString())
                 .add("status", track.toBangumiStatus())
@@ -45,7 +44,7 @@ class BangumiApi(private val client: OkHttpClient, interceptor: BangumiIntercept
     }
 
     suspend fun updateLibManga(track: Track): Track {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             // read status update
             val sbody = FormBody.Builder()
                 .add("status", track.toBangumiStatus())
@@ -69,7 +68,7 @@ class BangumiApi(private val client: OkHttpClient, interceptor: BangumiIntercept
     }
 
     suspend fun search(search: String): List<TrackSearch> {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val url = "$apiUrl/search/subject/${URLEncoder.encode(search, Charsets.UTF_8.name())}"
                 .toUri()
                 .buildUpon()
@@ -117,7 +116,7 @@ class BangumiApi(private val client: OkHttpClient, interceptor: BangumiIntercept
     }
 
     suspend fun findLibManga(track: Track): Track? {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             authClient.newCall(GET("$apiUrl/subject/${track.media_id}"))
                 .await()
                 .parseAs<JsonObject>()
@@ -126,7 +125,7 @@ class BangumiApi(private val client: OkHttpClient, interceptor: BangumiIntercept
     }
 
     suspend fun statusLibManga(track: Track): Track? {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val urlUserRead = "$apiUrl/collection/${track.media_id}"
             val requestUserRead = Request.Builder()
                 .url(urlUserRead)
@@ -147,7 +146,7 @@ class BangumiApi(private val client: OkHttpClient, interceptor: BangumiIntercept
     }
 
     suspend fun accessToken(code: String): OAuth {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             client.newCall(accessTokenRequest(code))
                 .await()
                 .parseAs()

app/src/main/java/eu/kanade/tachiyomi/data/track/kitsu/KitsuApi.kt

@@ -8,8 +8,7 @@ import eu.kanade.tachiyomi.network.POST
 import eu.kanade.tachiyomi.network.await
 import eu.kanade.tachiyomi.network.jsonMime
 import eu.kanade.tachiyomi.network.parseAs
-import kotlinx.coroutines.Dispatchers
+import eu.kanade.tachiyomi.util.lang.withIOContext
-import kotlinx.coroutines.withContext
 import kotlinx.serialization.json.JsonObject
 import kotlinx.serialization.json.buildJsonObject
 import kotlinx.serialization.json.int
@@ -31,7 +30,7 @@ class KitsuApi(private val client: OkHttpClient, interceptor: KitsuInterceptor)
     private val authClient = client.newBuilder().addInterceptor(interceptor).build()
 
     suspend fun addLibManga(track: Track, userId: String): Track {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val data = buildJsonObject {
                 putJsonObject("data") {
                     put("type", "libraryEntries")
@@ -76,7 +75,7 @@ class KitsuApi(private val client: OkHttpClient, interceptor: KitsuInterceptor)
     }
 
     suspend fun updateLibManga(track: Track): Track {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val data = buildJsonObject {
                 putJsonObject("data") {
                     put("type", "libraryEntries")
@@ -110,7 +109,7 @@ class KitsuApi(private val client: OkHttpClient, interceptor: KitsuInterceptor)
     }
 
     suspend fun search(query: String): List<TrackSearch> {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             authClient.newCall(GET(algoliaKeyUrl))
                 .await()
                 .parseAs<JsonObject>()
@@ -122,7 +121,7 @@ class KitsuApi(private val client: OkHttpClient, interceptor: KitsuInterceptor)
     }
 
     private suspend fun algoliaSearch(key: String, query: String): List<TrackSearch> {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val jsonObject = buildJsonObject {
                 put("params", "query=$query$algoliaFilter")
             }
@@ -151,7 +150,7 @@ class KitsuApi(private val client: OkHttpClient, interceptor: KitsuInterceptor)
     }
 
     suspend fun findLibManga(track: Track, userId: String): Track? {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val url = "${baseUrl}library-entries".toUri().buildUpon()
                 .encodedQuery("filter[manga_id]=${track.media_id}&filter[user_id]=$userId")
                 .appendQueryParameter("include", "manga")
@@ -172,7 +171,7 @@ class KitsuApi(private val client: OkHttpClient, interceptor: KitsuInterceptor)
     }
 
     suspend fun getLibManga(track: Track): Track {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val url = "${baseUrl}library-entries".toUri().buildUpon()
                 .encodedQuery("filter[id]=${track.media_id}")
                 .appendQueryParameter("include", "manga")
@@ -193,7 +192,7 @@ class KitsuApi(private val client: OkHttpClient, interceptor: KitsuInterceptor)
     }
 
     suspend fun login(username: String, password: String): OAuth {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val formBody: RequestBody = FormBody.Builder()
                 .add("username", username)
                 .add("password", password)
@@ -208,7 +207,7 @@ class KitsuApi(private val client: OkHttpClient, interceptor: KitsuInterceptor)
     }
 
     suspend fun getCurrentUser(): String {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val url = "${baseUrl}users".toUri().buildUpon()
                 .encodedQuery("filter[self]=true")
                 .build()

app/src/main/java/eu/kanade/tachiyomi/data/track/myanimelist/MyAnimeListApi.kt

@@ -10,10 +10,9 @@ import eu.kanade.tachiyomi.network.POST
 import eu.kanade.tachiyomi.network.await
 import eu.kanade.tachiyomi.network.parseAs
 import eu.kanade.tachiyomi.util.PkceUtil
-import kotlinx.coroutines.Dispatchers
+import eu.kanade.tachiyomi.util.lang.withIOContext
 import kotlinx.coroutines.async
 import kotlinx.coroutines.awaitAll
-import kotlinx.coroutines.withContext
 import kotlinx.serialization.json.JsonObject
 import kotlinx.serialization.json.boolean
 import kotlinx.serialization.json.contentOrNull
@@ -33,7 +32,7 @@ class MyAnimeListApi(private val client: OkHttpClient, interceptor: MyAnimeListI
     private val authClient = client.newBuilder().addInterceptor(interceptor).build()
 
     suspend fun getAccessToken(authCode: String): OAuth {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val formBody: RequestBody = FormBody.Builder()
                 .add("client_id", clientId)
                 .add("code", authCode)
@@ -47,7 +46,7 @@ class MyAnimeListApi(private val client: OkHttpClient, interceptor: MyAnimeListI
     }
 
     suspend fun getCurrentUser(): String {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val request = Request.Builder()
                 .url("$baseApiUrl/users/@me")
                 .get()
@@ -60,7 +59,7 @@ class MyAnimeListApi(private val client: OkHttpClient, interceptor: MyAnimeListI
     }
 
     suspend fun search(query: String): List<TrackSearch> {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val url = "$baseApiUrl/manga".toUri().buildUpon()
                 .appendQueryParameter("q", query)
                 .appendQueryParameter("nsfw", "true")
@@ -82,7 +81,7 @@ class MyAnimeListApi(private val client: OkHttpClient, interceptor: MyAnimeListI
     }
 
     suspend fun getMangaDetails(id: Int): TrackSearch {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val url = "$baseApiUrl/manga".toUri().buildUpon()
                 .appendPath(id.toString())
                 .appendQueryParameter("fields", "id,title,synopsis,num_chapters,main_picture,status,media_type,start_date")
@@ -113,7 +112,7 @@ class MyAnimeListApi(private val client: OkHttpClient, interceptor: MyAnimeListI
     }
 
     suspend fun getListItem(track: Track): Track {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val formBody: RequestBody = FormBody.Builder()
                 .add("status", track.toMyAnimeListStatus() ?: "reading")
                 .build()
@@ -129,7 +128,7 @@ class MyAnimeListApi(private val client: OkHttpClient, interceptor: MyAnimeListI
     }
 
     suspend fun addItemToList(track: Track): Track {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val formBody: RequestBody = FormBody.Builder()
                 .add("status", "reading")
                 .add("score", "0")
@@ -146,7 +145,7 @@ class MyAnimeListApi(private val client: OkHttpClient, interceptor: MyAnimeListI
     }
 
     suspend fun updateItem(track: Track): Track {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val formBody: RequestBody = FormBody.Builder()
                 .add("status", track.toMyAnimeListStatus() ?: "reading")
                 .add("is_rereading", (track.status == MyAnimeList.REREADING).toString())
@@ -188,7 +187,7 @@ class MyAnimeListApi(private val client: OkHttpClient, interceptor: MyAnimeListI
     }
 
     suspend fun findListItems(query: String, offset: Int = 0): List<TrackSearch> {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val json = getListPage(offset)
             val obj = json.jsonObject
 
@@ -215,7 +214,7 @@ class MyAnimeListApi(private val client: OkHttpClient, interceptor: MyAnimeListI
     }
 
     private suspend fun getListPage(offset: Int): JsonObject {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val urlBuilder = "$baseApiUrl/users/@me/mangalist".toUri().buildUpon()
                 .appendQueryParameter("fields", "list_status")
                 .appendQueryParameter("limit", listPaginationAmount.toString())

app/src/main/java/eu/kanade/tachiyomi/data/track/shikimori/ShikimoriApi.kt

@@ -9,9 +9,8 @@ import eu.kanade.tachiyomi.network.POST
 import eu.kanade.tachiyomi.network.await
 import eu.kanade.tachiyomi.network.jsonMime
 import eu.kanade.tachiyomi.network.parseAs
-import kotlinx.coroutines.Dispatchers
+import eu.kanade.tachiyomi.util.lang.withIOContext
 import kotlinx.coroutines.runBlocking
-import kotlinx.coroutines.withContext
 import kotlinx.serialization.json.JsonArray
 import kotlinx.serialization.json.JsonObject
 import kotlinx.serialization.json.buildJsonObject
@@ -30,7 +29,7 @@ class ShikimoriApi(private val client: OkHttpClient, interceptor: ShikimoriInter
     private val authClient = client.newBuilder().addInterceptor(interceptor).build()
 
     suspend fun addLibManga(track: Track, user_id: String): Track {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val payload = buildJsonObject {
                 putJsonObject("user_rate") {
                     put("user_id", user_id)
@@ -54,7 +53,7 @@ class ShikimoriApi(private val client: OkHttpClient, interceptor: ShikimoriInter
     suspend fun updateLibManga(track: Track, user_id: String): Track = addLibManga(track, user_id)
 
     suspend fun search(search: String): List<TrackSearch> {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val url = "$apiUrl/mangas".toUri().buildUpon()
                 .appendQueryParameter("order", "popularity")
                 .appendQueryParameter("search", search)
@@ -98,7 +97,7 @@ class ShikimoriApi(private val client: OkHttpClient, interceptor: ShikimoriInter
     }
 
     suspend fun findLibManga(track: Track, user_id: String): Track? {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             val urlMangas = "$apiUrl/mangas".toUri().buildUpon()
                 .appendPath(track.media_id.toString())
                 .build()
@@ -138,7 +137,7 @@ class ShikimoriApi(private val client: OkHttpClient, interceptor: ShikimoriInter
     }
 
     suspend fun accessToken(code: String): OAuth {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             client.newCall(accessTokenRequest(code))
                 .await()
                 .parseAs()

app/src/main/java/eu/kanade/tachiyomi/data/updater/github/GithubUpdateChecker.kt

@@ -6,8 +6,7 @@ import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.NetworkHelper
 import eu.kanade.tachiyomi.network.await
 import eu.kanade.tachiyomi.network.parseAs
-import kotlinx.coroutines.Dispatchers
+import eu.kanade.tachiyomi.util.lang.withIOContext
-import kotlinx.coroutines.withContext
 import uy.kohesive.injekt.injectLazy
 
 class GithubUpdateChecker {
@@ -23,7 +22,7 @@ class GithubUpdateChecker {
     }
 
     suspend fun checkForUpdate(): UpdateResult {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             networkService.client
                 .newCall(GET("https://api.github.com/repos/$repo/releases/latest"))
                 .await()

app/src/main/java/eu/kanade/tachiyomi/extension/api/ExtensionGithubApi.kt

@@ -9,8 +9,7 @@ import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.NetworkHelper
 import eu.kanade.tachiyomi.network.await
 import eu.kanade.tachiyomi.network.parseAs
-import kotlinx.coroutines.Dispatchers
+import eu.kanade.tachiyomi.util.lang.withIOContext
-import kotlinx.coroutines.withContext
 import kotlinx.serialization.json.JsonArray
 import kotlinx.serialization.json.int
 import kotlinx.serialization.json.jsonObject
@@ -24,7 +23,7 @@ internal class ExtensionGithubApi {
     private val preferences: PreferencesHelper by injectLazy()
 
     suspend fun findExtensions(): List<Extension.Available> {
-        return withContext(Dispatchers.IO) {
+        return withIOContext {
             networkService.client
                 .newCall(GET("${REPO_URL_PREFIX}index.min.json"))
                 .await()

app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/search/SearchPresenter.kt

@@ -55,13 +55,13 @@ class SearchPresenter(
 
         replacingMangaRelay.call(true)
 
-        launchIO {
+        presenterScope.launchIO {
             val chapters = source.getChapterList(manga.toMangaInfo())
                 .map { it.toSChapter() }
 
             migrateMangaInternal(source, chapters, prevManga, manga, replace)
         }.invokeOnCompletion {
-            launchUI { replacingMangaRelay.call(false) }
+            presenterScope.launchUI { replacingMangaRelay.call(false) }
         }
     }
 

app/src/main/java/eu/kanade/tachiyomi/ui/browse/source/browse/BrowseSourcePresenter.kt

@@ -31,7 +31,7 @@ import eu.kanade.tachiyomi.ui.browse.source.filter.TriStateItem
 import eu.kanade.tachiyomi.ui.browse.source.filter.TriStateSectionItem
 import eu.kanade.tachiyomi.util.chapter.ChapterSettingsHelper
 import eu.kanade.tachiyomi.util.lang.launchIO
-import eu.kanade.tachiyomi.util.lang.launchUI
+import eu.kanade.tachiyomi.util.lang.withUIContext
 import eu.kanade.tachiyomi.util.removeCovers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asFlow
@@ -213,12 +213,12 @@ open class BrowseSourcePresenter(
      * @param mangas the list of manga to initialize.
      */
     fun initializeMangas(mangas: List<Manga>) {
-        launchIO {
+        presenterScope.launchIO {
             mangas.asFlow()
                 .filter { it.thumbnail_url == null && !it.initialized }
                 .map { getMangaDetails(it) }
                 .onEach {
-                    launchUI {
+                    withUIContext {
                         @Suppress("DEPRECATION")
                         view?.onMangaInitialized(it)
                     }

app/src/main/java/eu/kanade/tachiyomi/ui/main/MainActivity.kt

@@ -292,7 +292,7 @@ class MainActivity : BaseViewBindingActivity<MainActivityBinding>() {
             setSelectedNavItem(startScreenId)
         } else if (shouldHandleExitConfirmation()) {
             // Exit confirmation (resets after 2 seconds)
-            launchUI { resetExitConfirmation() }
+            lifecycleScope.launchUI { resetExitConfirmation() }
         } else if (backstackSize == 1 || !router.handleBack()) {
             // Regular back
             super.onBackPressed()

app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaPresenter.kt

@@ -26,7 +26,7 @@ import eu.kanade.tachiyomi.util.chapter.syncChaptersWithSource
 import eu.kanade.tachiyomi.util.isLocal
 import eu.kanade.tachiyomi.util.lang.await
 import eu.kanade.tachiyomi.util.lang.launchIO
-import eu.kanade.tachiyomi.util.lang.launchUI
+import eu.kanade.tachiyomi.util.lang.withUIContext
 import eu.kanade.tachiyomi.util.prepUpdateCover
 import eu.kanade.tachiyomi.util.removeCovers
 import eu.kanade.tachiyomi.util.shouldDownloadNewChapters
@@ -161,7 +161,7 @@ class MangaPresenter(
      */
     fun fetchMangaFromSource(manualFetch: Boolean = false) {
         if (fetchMangaJob?.isActive == true) return
-        fetchMangaJob = launchIO {
+        fetchMangaJob = presenterScope.launchIO {
             try {
                 val networkManga = source.getMangaDetails(manga.toMangaInfo())
                 val sManga = networkManga.toSManga()
@@ -170,9 +170,9 @@ class MangaPresenter(
                 manga.initialized = true
                 db.insertManga(manga).await()
 
-                launchUI { view?.onFetchMangaInfoDone() }
+                withUIContext { view?.onFetchMangaInfoDone() }
             } catch (e: Throwable) {
-                launchUI { view?.onFetchMangaInfoError(e) }
+                withUIContext { view?.onFetchMangaInfoError(e) }
             }
         }
     }
@@ -360,9 +360,9 @@ class MangaPresenter(
                     downloadNewChapters(newChapters)
                 }
 
-                launchUI { view?.onFetchChaptersDone() }
+                withUIContext { view?.onFetchChaptersDone() }
             } catch (e: Throwable) {
-                launchUI { view?.onFetchChaptersError(e) }
+                withUIContext { view?.onFetchChaptersError(e) }
             }
         }
     }

app/src/main/java/eu/kanade/tachiyomi/ui/manga/track/TrackPresenter.kt

@@ -10,11 +10,12 @@ import eu.kanade.tachiyomi.data.track.TrackService
 import eu.kanade.tachiyomi.ui.base.presenter.BasePresenter
 import eu.kanade.tachiyomi.util.lang.await
 import eu.kanade.tachiyomi.util.lang.launchIO
-import eu.kanade.tachiyomi.util.lang.launchUI
+import eu.kanade.tachiyomi.util.lang.withUIContext
 import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.async
 import kotlinx.coroutines.awaitAll
+import kotlinx.coroutines.supervisorScope
 import rx.Subscription
 import rx.android.schedulers.AndroidSchedulers
 import uy.kohesive.injekt.Injekt
@@ -59,6 +60,7 @@ class TrackPresenter(
     fun refresh() {
         refreshJob?.cancel()
         refreshJob = launchIO {
+            supervisorScope {
                 try {
                     trackList
                         .filter { it.track != null }
@@ -70,9 +72,10 @@ class TrackPresenter(
                         }
                         .awaitAll()
 
-                view?.onRefreshDone()
+                    withUIContext { view?.onRefreshDone() }
                 } catch (e: Throwable) {
-                view?.onRefreshError(e)
+                    withUIContext { view?.onRefreshError(e) }
+                }
             }
         }
     }
@@ -82,9 +85,9 @@ class TrackPresenter(
         searchJob = launchIO {
             try {
                 val results = service.search(query)
-                launchUI { view?.onSearchResults(results) }
+                withUIContext { view?.onSearchResults(results) }
             } catch (e: Throwable) {
-                launchUI { view?.onSearchResultsError(e) }
+                withUIContext { view?.onSearchResultsError(e) }
             }
         }
     }
@@ -97,7 +100,7 @@ class TrackPresenter(
                     service.bind(item)
                     db.insertTrack(item).await()
                 } catch (e: Throwable) {
-                    launchUI { context.toast(e.message) }
+                    withUIContext { context.toast(e.message) }
                 }
             }
         } else {
@@ -114,9 +117,9 @@ class TrackPresenter(
             try {
                 service.update(track)
                 db.insertTrack(track).await()
-                view?.onRefreshDone()
+                withUIContext { view?.onRefreshDone() }
             } catch (e: Throwable) {
-                launchUI { view?.onRefreshError(e) }
+                withUIContext { view?.onRefreshError(e) }
 
                 // Restart on error to set old values
                 fetchTrackings()

app/src/main/java/eu/kanade/tachiyomi/ui/setting/track/TrackLoginDialog.kt

@@ -8,7 +8,7 @@ import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.track.TrackManager
 import eu.kanade.tachiyomi.data.track.TrackService
 import eu.kanade.tachiyomi.util.lang.launchIO
-import eu.kanade.tachiyomi.util.lang.launchUI
+import eu.kanade.tachiyomi.util.lang.withUIContext
 import eu.kanade.tachiyomi.util.system.toast
 import eu.kanade.tachiyomi.widget.preference.LoginDialogPreference
 import uy.kohesive.injekt.Injekt
@@ -46,11 +46,11 @@ class TrackLoginDialog(
             try {
                 service.login(user, pass)
                 dialog?.dismiss()
-                launchUI { view?.context?.toast(R.string.login_success) }
+                withUIContext { view?.context?.toast(R.string.login_success) }
             } catch (e: Throwable) {
                 binding?.login?.progress = -1
                 binding?.login?.setText(R.string.unknown_error)
-                launchUI { e.message?.let { view?.context?.toast(it) } }
+                withUIContext { e.message?.let { view?.context?.toast(it) } }
             }
         }
     }

app/src/main/java/eu/kanade/tachiyomi/util/lang/CoroutinesExtensions.kt

@@ -6,6 +6,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 
 fun launchUI(block: suspend CoroutineScope.() -> Unit): Job =
     GlobalScope.launch(Dispatchers.Main, CoroutineStart.DEFAULT, block)
@@ -15,3 +16,13 @@ fun launchIO(block: suspend CoroutineScope.() -> Unit): Job =
 
 fun launchNow(block: suspend CoroutineScope.() -> Unit): Job =
     GlobalScope.launch(Dispatchers.Main, CoroutineStart.UNDISPATCHED, block)
+
+fun CoroutineScope.launchUI(block: suspend CoroutineScope.() -> Unit): Job =
+    launch(Dispatchers.Main, block = block)
+
+fun CoroutineScope.launchIO(block: suspend CoroutineScope.() -> Unit): Job =
+    launch(Dispatchers.IO, block = block)
+
+suspend fun <T> withUIContext(block: suspend CoroutineScope.() -> T) = withContext(Dispatchers.Main, block)
+
+suspend fun <T> withIOContext(block: suspend CoroutineScope.() -> T) = withContext(Dispatchers.IO, block)