diff --git a/app/src/main/java/eu/kanade/tachiyomi/source/online/all/MergedSource.kt b/app/src/main/java/eu/kanade/tachiyomi/source/online/all/MergedSource.kt
index ea677d698..21fe778db 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/source/online/all/MergedSource.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/source/online/all/MergedSource.kt
@@ -136,7 +136,7 @@ class MergedSource : SuspendHttpSource() {
 
         val ifDownloadNewChapters = downloadChapters && manga.shouldDownloadNewChapters(db, preferences)
         return mangaReferences.filter { it.mangaSourceId != MERGED_SOURCE_ID }.map {
-            load(db, sourceManager, it)
+            it.load(db, sourceManager)
         }.mapNotNull { loadedManga ->
             withContext(Dispatchers.IO) {
                 if (loadedManga.manga != null && loadedManga.reference.getChapterUpdates) {
@@ -165,23 +165,23 @@ class MergedSource : SuspendHttpSource() {
         }
     }
 
-    suspend fun load(db: DatabaseHelper, sourceManager: SourceManager, reference: MergedMangaReference): LoadedMangaSource {
-        var manga = db.getManga(reference.mangaUrl, reference.mangaSourceId).await()
-        val source = sourceManager.getOrStub(manga?.source ?: reference.mangaSourceId)
+    suspend fun MergedMangaReference.load(db: DatabaseHelper, sourceManager: SourceManager): LoadedMangaSource {
+        var manga = db.getManga(mangaUrl, mangaSourceId).await()
+        val source = sourceManager.getOrStub(manga?.source ?: mangaSourceId)
         if (manga == null) {
-            manga = Manga.create(reference.mangaSourceId).apply {
-                url = reference.mangaUrl
+            manga = Manga.create(mangaSourceId).apply {
+                url = mangaUrl
             }
             manga.copyFrom(source.getMangaDetails(manga.toMangaInfo()).toSManga())
             try {
                 manga.id = db.insertManga(manga).await().insertedId()
-                reference.mangaId = manga.id
-                db.insertNewMergedMangaId(reference).await()
+                mangaId = manga.id
+                db.insertNewMergedMangaId(this).await()
             } catch (e: Exception) {
                 XLog.tag("MergedSource").enableStackTrace(e.stackTrace.contentToString(), 5)
             }
         }
-        return LoadedMangaSource(source, manga, reference)
+        return LoadedMangaSource(source, manga, this)
     }
 
     data class LoadedMangaSource(val source: Source, val manga: Manga?, val reference: MergedMangaReference)
diff --git a/app/src/main/java/exh/ui/base/CoroutinePresenter.kt b/app/src/main/java/exh/ui/base/CoroutinePresenter.kt
index 2ad6238b2..d6cb5f026 100644
--- a/app/src/main/java/exh/ui/base/CoroutinePresenter.kt
+++ b/app/src/main/java/exh/ui/base/CoroutinePresenter.kt
@@ -1,41 +1,60 @@
 package exh.ui.base
 
 import androidx.annotation.CallSuper
+import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.mapNotNull
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import nucleus.presenter.Presenter
+import kotlin.coroutines.CoroutineContext
+import kotlin.coroutines.EmptyCoroutineContext
 
-@Suppress("DEPRECATION")
-open class CoroutinePresenter<V> : Presenter<V>() {
-    val scope = CoroutineScope(Job() + Dispatchers.Main)
-
+@Suppress("DEPRECATION", "unused")
+open class CoroutinePresenter<V>(
+    scope: CoroutineScope = CoroutineScope(Job() + Dispatchers.Main)
+) : Presenter<V>(),
+    CoroutineScope by scope
+{
     @Suppress("DeprecatedCallableAddReplaceWith")
-    @Deprecated("Use launchInView")
+    @Deprecated("Use launchInView, Flow.inView, Flow.mapView")
     override fun getView(): V? {
         return super.getView()
     }
 
-    fun launchInView(block: (CoroutineScope, V) -> Unit) = scope.launch(Dispatchers.Main) {
+    fun launchInView(block: (CoroutineScope, V) -> Unit) = launch(Dispatchers.Main) {
         view?.let { block.invoke(this, it) }
     }
 
-    fun <F> Flow<F>.onEachView(block: (V, F) -> Unit) = onEach {
-        view?.let { view -> block(view, it) }
+    inline fun <F> Flow<F>.inView(crossinline block: (V, F) -> Unit) = onEach {
+        withContext(Dispatchers.Main) {
+            view?.let { view -> block(view, it) }
+        }
     }
 
-    fun <F, P> Flow<F>.mapView(block: (V, F) -> P): Flow<P> = mapNotNull {
-        view?.let { view -> block(view, it) }
+    inline fun <F, P> Flow<F>.mapView(crossinline block: (V, F) -> P): Flow<P> {
+        return mapNotNull {
+            withContext(Dispatchers.Main) {
+                view?.let { view -> block(view, it) }
+            }
+        }
     }
 
+    fun Flow<*>.launchUnderContext(context: CoroutineContext = EmptyCoroutineContext)  =
+        launch(this + context) { this@launchInHere.collect() }
+
+    fun Flow<*>.launch() = launchIn(this)
+
     @CallSuper
     override fun destroy() {
         super.destroy()
-        scope.cancel()
+        cancel()
     }
 }
diff --git a/app/src/main/java/exh/ui/metadata/MetadataViewPresenter.kt b/app/src/main/java/exh/ui/metadata/MetadataViewPresenter.kt
index a040e9fd3..483b19612 100644
--- a/app/src/main/java/exh/ui/metadata/MetadataViewPresenter.kt
+++ b/app/src/main/java/exh/ui/metadata/MetadataViewPresenter.kt
@@ -41,13 +41,13 @@ class MetadataViewPresenter(
                     meta.value = it.raise(mainSource.metaClass)
                 }
             }
-            .launchIn(scope + Dispatchers.IO)
+            .launchUnderContext(Dispatchers.IO)
 
         meta
-            .onEachView { view, metadata ->
+            .inView { view, metadata ->
                 view.onNextMangaInfo(metadata)
             }
-            .launchIn(scope)
+            .launch()
     }
 
     private fun getMangaMetaObservable(): Flow<FlatMetadata?> {
diff --git a/app/src/main/java/exh/ui/smartsearch/SmartSearchPresenter.kt b/app/src/main/java/exh/ui/smartsearch/SmartSearchPresenter.kt
index 9b62f39d2..b91af4c1a 100644
--- a/app/src/main/java/exh/ui/smartsearch/SmartSearchPresenter.kt
+++ b/app/src/main/java/exh/ui/smartsearch/SmartSearchPresenter.kt
@@ -21,7 +21,7 @@ class SmartSearchPresenter(private val source: CatalogueSource, private val conf
     override fun onCreate(savedState: Bundle?) {
         super.onCreate(savedState)
 
-        scope.launch(Dispatchers.IO) {
+        launch(Dispatchers.IO) {
             val result = try {
                 val resultManga = smartSearchEngine.smartSearch(source, config.origTitle)
                 if (resultManga != null) {