fix #2956 - prevent ANR during some automatic feed update

core/src/main/java/de/danoeh/antennapod/core/util/FeedUpdateUtils.java

@@ -17,6 +17,9 @@ public class FeedUpdateUtils {
     private FeedUpdateUtils() {}
 
     public static void startAutoUpdate(Context context, Runnable callback) {
+        // the network check is blocking for possibly a long time: so run the logic
+        // in a separate thread to prevent the code blocking the callers
+        final Runnable runnable = () -> {
             try {
                 with().pollInterval(1, TimeUnit.SECONDS)
                         .await()
@@ -26,6 +29,8 @@ public class FeedUpdateUtils {
             } catch (ConditionTimeoutException ignore) {
                 Log.d(TAG, "Blocking automatic update: no wifi available / no mobile updates allowed");
             }
+        };
+        new Thread(runnable).start();
     }
 
 }