diff --git a/app/src/main/java/org/koitharu/kotatsu/base/ui/list/SectionedSelectionController.kt b/app/src/main/java/org/koitharu/kotatsu/base/ui/list/SectionedSelectionController.kt
index 3f7abea0b..d210c6991 100644
--- a/app/src/main/java/org/koitharu/kotatsu/base/ui/list/SectionedSelectionController.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/base/ui/list/SectionedSelectionController.kt
@@ -2,20 +2,20 @@ package org.koitharu.kotatsu.base.ui.list
 
 import android.app.Activity
 import android.os.Bundle
-import android.util.ArrayMap
 import android.view.Menu
 import android.view.MenuItem
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.view.ActionMode
+import androidx.collection.ArrayMap
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
 import androidx.lifecycle.LifecycleOwner
 import androidx.recyclerview.widget.RecyclerView
 import androidx.savedstate.SavedStateRegistry
 import androidx.savedstate.SavedStateRegistryOwner
-import kotlin.coroutines.EmptyCoroutineContext
 import kotlinx.coroutines.Dispatchers
 import org.koitharu.kotatsu.base.ui.list.decor.AbstractSelectionItemDecoration
+import kotlin.coroutines.EmptyCoroutineContext
 
 private const val PROVIDER_NAME = "selection_decoration_sectioned"
 
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/exceptions/resolve/ExceptionResolver.kt b/app/src/main/java/org/koitharu/kotatsu/core/exceptions/resolve/ExceptionResolver.kt
index 8ae3565e5..b7147aadd 100644
--- a/app/src/main/java/org/koitharu/kotatsu/core/exceptions/resolve/ExceptionResolver.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/core/exceptions/resolve/ExceptionResolver.kt
@@ -1,9 +1,9 @@
 package org.koitharu.kotatsu.core.exceptions.resolve
 
-import android.util.ArrayMap
 import androidx.activity.result.ActivityResultCallback
 import androidx.activity.result.ActivityResultLauncher
 import androidx.annotation.StringRes
+import androidx.collection.ArrayMap
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentActivity
 import kotlinx.coroutines.suspendCancellableCoroutine
diff --git a/app/src/main/java/org/koitharu/kotatsu/sync/domain/SyncController.kt b/app/src/main/java/org/koitharu/kotatsu/sync/domain/SyncController.kt
index 9dff00923..c0c00aeab 100644
--- a/app/src/main/java/org/koitharu/kotatsu/sync/domain/SyncController.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/sync/domain/SyncController.kt
@@ -5,16 +5,17 @@ import android.accounts.AccountManager
 import android.content.ContentResolver
 import android.content.Context
 import android.os.Bundle
-import android.util.ArrayMap
+import androidx.collection.ArrayMap
 import androidx.room.InvalidationTracker
 import androidx.room.withTransaction
 import dagger.hilt.android.qualifiers.ApplicationContext
-import java.util.concurrent.TimeUnit
-import javax.inject.Inject
-import javax.inject.Singleton
-import kotlinx.coroutines.*
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
+import kotlinx.coroutines.withContext
 import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.db.MangaDatabase
@@ -22,6 +23,9 @@ import org.koitharu.kotatsu.core.db.TABLE_FAVOURITES
 import org.koitharu.kotatsu.core.db.TABLE_FAVOURITE_CATEGORIES
 import org.koitharu.kotatsu.core.db.TABLE_HISTORY
 import org.koitharu.kotatsu.utils.ext.processLifecycleScope
+import java.util.concurrent.TimeUnit
+import javax.inject.Inject
+import javax.inject.Singleton
 
 @Singleton
 class SyncController @Inject constructor(
diff --git a/app/src/main/java/org/koitharu/kotatsu/utils/CompositeMutex.kt b/app/src/main/java/org/koitharu/kotatsu/utils/CompositeMutex.kt
index 5f4f12fda..859e7e391 100644
--- a/app/src/main/java/org/koitharu/kotatsu/utils/CompositeMutex.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/utils/CompositeMutex.kt
@@ -1,14 +1,14 @@
 package org.koitharu.kotatsu.utils
 
-import android.util.ArrayMap
-import java.util.*
-import kotlin.coroutines.coroutineContext
-import kotlin.coroutines.resume
+import androidx.collection.ArrayMap
 import kotlinx.coroutines.CancellableContinuation
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.suspendCancellableCoroutine
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
+import java.util.LinkedList
+import kotlin.coroutines.coroutineContext
+import kotlin.coroutines.resume
 
 class CompositeMutex<T : Any> : Set<T> {
 
@@ -27,7 +27,7 @@ class CompositeMutex<T : Any> : Set<T> {
 	}
 
 	override fun isEmpty(): Boolean {
-		return data.isEmpty()
+		return data.isEmpty
 	}
 
 	override fun iterator(): Iterator<T> {
@@ -59,7 +59,7 @@ class CompositeMutex<T : Any> : Set<T> {
 
 	private suspend fun waitForRemoval(element: T) {
 		val list = data[element] ?: return
-		suspendCancellableCoroutine<Unit> { continuation ->
+		suspendCancellableCoroutine { continuation ->
 			list.add(continuation)
 			continuation.invokeOnCancellation {
 				list.remove(continuation)