Load extensions off the main thread (#3788)

Assisted-by: Claude:claude-opus-5

app/src/main/java/eu/kanade/tachiyomi/extension/ExtensionManager.kt

@@ -14,6 +14,7 @@ import eu.kanade.tachiyomi.extension.util.ExtensionInstaller
 import eu.kanade.tachiyomi.extension.util.ExtensionLoader
 import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -23,6 +24,7 @@ import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.emptyFlow
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
 import logcat.LogPriority
 import tachiyomi.core.common.util.lang.withUIContext
 import tachiyomi.core.common.util.system.logcat
@@ -72,8 +74,10 @@ class ExtensionManager(
     val untrustedExtensionsFlow = untrustedExtensionMapFlow.mapExtensions(scope)
 
     init {
-        initExtensions()
-        ExtensionInstallReceiver(InstallationListener()).register(context)
+        scope.launch(Dispatchers.IO) {
+            initExtensions()
+            ExtensionInstallReceiver(InstallationListener()).register(context)
+        }
     }
 
     private var subLanguagesEnabledOnFirstRun = preferences.enabledLanguages.isSet()

app/src/main/java/eu/kanade/tachiyomi/extension/util/ExtensionLoader.kt

@@ -15,6 +15,7 @@ import eu.kanade.tachiyomi.source.SourceFactory
 import eu.kanade.tachiyomi.util.lang.Hash
 import eu.kanade.tachiyomi.util.storage.copyAndSetReadOnlyTo
 import eu.kanade.tachiyomi.util.system.ChildFirstPathClassLoader
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.async
 import kotlinx.coroutines.awaitAll
 import kotlinx.coroutines.runBlocking
@@ -163,7 +164,7 @@ internal object ExtensionLoader {
         if (extPkgs.isEmpty()) return emptyList()
 
         // Load each extension concurrently and wait for completion
-        return runBlocking {
+        return runBlocking(Dispatchers.IO) {
             val deferred = extPkgs.map {
                 async { loadExtension(context, it) }
             }

app/src/main/java/eu/kanade/tachiyomi/source/AndroidSourceManager.kt

@@ -12,6 +12,7 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
@@ -45,6 +46,8 @@ class AndroidSourceManager(
 
     init {
         scope.launch {
+            extensionManager.isInitialized.first { it }
+
             extensionManager.installedExtensionsFlow
                 .collectLatest { extensions ->
                     val mutableMap = ConcurrentHashMap<Long, Source>(