2.x: fix & update Observable.repeatWhen and redoWhen (#4911)

Author: akarnokd

src/main/java/io/reactivex/Observable.java

@@ -8884,7 +8884,7 @@ public final Observable<T> repeatUntil(BooleanSupplier stop) {
     @SchedulerSupport(SchedulerSupport.NONE)
     public final Observable<T> repeatWhen(final Function<? super Observable<Object>, ? extends ObservableSource<?>> handler) {
         ObjectHelper.requireNonNull(handler, "handler is null");
-        return RxJavaPlugins.onAssembly(new ObservableRedo<T>(this, ObservableInternalHelper.repeatWhenHandler(handler), false));
+        return RxJavaPlugins.onAssembly(new ObservableRepeatWhen<T>(this, handler));
     }
 
     /**
@@ -9560,7 +9560,7 @@ public final Observable<T> retryUntil(final BooleanSupplier stop) {
     public final Observable<T> retryWhen(
             final Function<? super Observable<Throwable>, ? extends ObservableSource<?>> handler) {
         ObjectHelper.requireNonNull(handler, "handler is null");
-        return RxJavaPlugins.onAssembly(new ObservableRedo<T>(this, ObservableInternalHelper.retryWhenHandler(handler), true));
+        return RxJavaPlugins.onAssembly(new ObservableRetryWhen<T>(this, handler));
     }
 
     /**