Migrate More screen to Compose (#6990)

app/src/main/java/eu/kanade/tachiyomi/ui/base/presenter/BasePresenter.kt

@@ -1,6 +1,8 @@
 package eu.kanade.tachiyomi.ui.base.presenter
 
 import android.os.Bundle
+import com.fredporciuncula.flow.preferences.Preference
+import eu.kanade.core.prefs.PreferenceMutableState
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.MainScope
 import kotlinx.coroutines.cancel
@@ -10,7 +12,7 @@ import rx.Observable
 
 open class BasePresenter<V> : RxPresenter<V>() {
 
-    lateinit var presenterScope: CoroutineScope
+    var presenterScope: CoroutineScope = MainScope()
 
     /**
      * Query from the view where applicable
@@ -20,7 +22,6 @@ open class BasePresenter<V> : RxPresenter<V>() {
     override fun onCreate(savedState: Bundle?) {
         try {
             super.onCreate(savedState)
-            presenterScope = MainScope()
         } catch (e: NullPointerException) {
             // Swallow this error. This should be fixed in the library but since it's not critical
             // (only used by restartables) it should be enough. It saves me a fork.
@@ -38,6 +39,8 @@ open class BasePresenter<V> : RxPresenter<V>() {
         return super.getView()
     }
 
+    fun <T> Preference<T>.asState() = PreferenceMutableState(this, presenterScope)
+
     /**
      * Subscribes an observable with [deliverFirst] and adds it to the presenter's lifecycle
      * subscription list.