Add EventHub, add fav, reblog events, improve timelines (#562)

* Add AppStore, add fav, reblog events

* Add events, add handling to Timeline

* Add event handling to Notifications

* Mostly finish events

* Fix unsubscribing

* Cleanup timeline

* Fix newStatusEvent in thread, fix deleteEvent

* Insert new toots only in specific timelines

* Add missing else

* Rename AppStore to EventHub

* Fix tests

* Use DiffUtils for timeline

* Fix empty timeline bug. Improve loading placeholder

* Fix AsyncListDiff, loading indicator, "load more"

* Timeline fixes & improvements.

Fix infinite loading. Remove spinner correctly.
Don't refresh timeline without need.

app/src/main/java/com/keylesspalace/tusky/viewdata/StatusViewData.java

@@ -24,9 +24,11 @@ import com.keylesspalace.tusky.entity.Emoji;
 import com.keylesspalace.tusky.entity.Status;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.Date;
 import java.util.List;
+import java.util.Objects;
 
 /**
  * Created by charlag on 11/07/2017.
@@ -40,6 +42,10 @@ public abstract class StatusViewData {
     private StatusViewData() {
     }
 
+    public abstract long getViewDataId();
+
+    public abstract boolean deepEquals(StatusViewData other);
+
     public static final class Concrete extends StatusViewData {
         private final String id;
         private final Spanned content;
@@ -214,18 +220,84 @@ public abstract class StatusViewData {
             return card;
         }
 
+        @Override public long getViewDataId() {
+            // Chance of collision is super low and impact of mistake is low as well
+            return getId().hashCode();
+        }
+
+        public boolean deepEquals(StatusViewData o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            Concrete concrete = (Concrete) o;
+            return reblogged == concrete.reblogged &&
+                favourited == concrete.favourited &&
+                isSensitive == concrete.isSensitive &&
+                isExpanded == concrete.isExpanded &&
+                isShowingContent == concrete.isShowingContent &&
+                reblogsCount == concrete.reblogsCount &&
+                favouritesCount == concrete.favouritesCount &&
+                rebloggingEnabled == concrete.rebloggingEnabled &&
+                Objects.equals(id, concrete.id) &&
+                Objects.equals(content, concrete.content) &&
+                Objects.equals(spoilerText, concrete.spoilerText) &&
+                visibility == concrete.visibility &&
+                Objects.equals(attachments, concrete.attachments) &&
+                Objects.equals(rebloggedByUsername, concrete.rebloggedByUsername) &&
+                Objects.equals(rebloggedAvatar, concrete.rebloggedAvatar) &&
+                Objects.equals(userFullName, concrete.userFullName) &&
+                Objects.equals(nickname, concrete.nickname) &&
+                Objects.equals(avatar, concrete.avatar) &&
+                Objects.equals(createdAt, concrete.createdAt) &&
+                Objects.equals(inReplyToId, concrete.inReplyToId) &&
+                Arrays.equals(mentions, concrete.mentions) &&
+                Objects.equals(senderId, concrete.senderId) &&
+                Objects.equals(application, concrete.application) &&
+                Objects.equals(emojis, concrete.emojis) &&
+                Objects.equals(card, concrete.card);
+        }
     }
 
     public static final class Placeholder extends StatusViewData {
         private final boolean isLoading;
+        private final long id;
 
-        public Placeholder(boolean isLoading) {
+        public Placeholder(long id, boolean isLoading) {
+            this.id = id;
             this.isLoading = isLoading;
         }
 
         public boolean isLoading() {
             return isLoading;
         }
+
+        public long getId() {
+            return id;
+        }
+
+        @Override public long getViewDataId() {
+            return id;
+        }
+
+        @Override public boolean deepEquals(StatusViewData other) {
+            if (!(other instanceof Placeholder)) return false;
+            Placeholder that = (Placeholder) other;
+            return isLoading == that.isLoading && id == that.id;
+        }
+
+        @Override public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+
+            Placeholder that = (Placeholder) o;
+
+            return deepEquals(that);
+        }
+
+        @Override public int hashCode() {
+            int result = (isLoading ? 1 : 0);
+            result = 31 * result + (int) (id ^ (id >>> 32));
+            return result;
+        }
     }
 
     public static class Builder {