fix: Show reactions as last events and refactor hasNewMessage

Reactions are triggering push
notifications and should therefore
be displayed as last events
in the room list of a client.
The body should just display
the reaction key.
This fixes that rooms with
new reactions can't set to
read.

lib/src/client.dart

@@ -190,6 +190,7 @@ class Client extends MatrixApi {
       EventTypes.Message,
       EventTypes.Encrypted,
       EventTypes.Sticker,
+      EventTypes.Reaction,
     ]);
 
     // register all the default commands

lib/src/room.dart

@@ -167,11 +167,7 @@ class Room {
       return;
     }
 
-    final isMessageEvent = [
-      EventTypes.Message,
-      EventTypes.Sticker,
-      EventTypes.Encrypted,
-    ].contains(state.type);
+    final isMessageEvent = client.roomPreviewLastEvents.contains(state.type);
 
     // We ignore events editing events older than the current-latest here so
     // i.e. newly sent edits for older events don't show up in room preview
@@ -514,9 +510,19 @@ class Room {
   /// Checks if the last event has a read marker of the user.
   bool get hasNewMessages {
     final lastEvent = this.lastEvent;
-    return lastEvent != null &&
-        !lastEvent.receipts
-            .any((receipt) => receipt.user.senderId == client.userID!);
+
+    // There is no known event or the last event is only a state fallback event,
+    // we assume there is no new messages.
+    if (lastEvent == null ||
+        !client.roomPreviewLastEvents.contains(lastEvent.type)) return false;
+
+    // Read marker is on the last event so no new messages.
+    if (lastEvent.receipts
+        .any((receipt) => receipt.user.senderId == client.userID!)) {
+      return false;
+    }
+
+    return true;
   }
 
   /// Returns true if this room is unread. To check if there are new messages

lib/src/utils/event_localizations.dart

@@ -213,7 +213,12 @@ abstract class EventLocalizations {
         _localizedBodyNormalMessage(event, i18n, body),
     EventTypes.Message: (event, i18n, body) =>
         _localizedBodyNormalMessage(event, i18n, body),
-    EventTypes.Reaction: (event, i18n, body) =>
-        _localizedBodyNormalMessage(event, i18n, body),
+    EventTypes.Reaction: (event, i18n, body) => i18n.sentReaction(
+          event.sender.calcDisplayname(),
+          event.content
+                  .tryGetMap<String, dynamic>('m.relates_to')
+                  ?.tryGet<String>('key') ??
+              body,
+        ),
   };
 }

lib/src/utils/matrix_localizations.dart

@@ -122,6 +122,8 @@ abstract class MatrixLocalizations {
 
   String sentAVideo(String senderName);
 
+  String sentReaction(String senderName, String reactionKey);
+
   String sharedTheLocation(String senderName);
 
   String couldNotDecryptMessage(String errorText);

test/matrix_default_localizations.dart

@@ -225,4 +225,9 @@ class MatrixDefaultLocalizations extends MatrixLocalizations {
   String startedACall(String senderName) {
     return 'startedACall';
   }
+
+  @override
+  String sentReaction(String senderName, String reactionKey) {
+    return '$senderName reacted with $reactionKey';
+  }
 }

test/room_test.dart

@@ -258,6 +258,26 @@ void main() {
       expect(room.lastEvent?.eventId, '5');
       expect(room.lastEvent?.body, 'edited cdc');
       expect(room.lastEvent?.status, EventStatus.sent);
+      // Are reactions coming through?
+      room.setState(
+        Event(
+          senderId: '@test:example.com',
+          type: EventTypes.Reaction,
+          room: room,
+          eventId: '123456',
+          originServerTs: DateTime.now(),
+          content: {
+            'm.relates_to': {
+              'rel_type': RelationshipTypes.reaction,
+              'event_id': '1234',
+              'key': ':-)',
+            }
+          },
+          stateKey: '',
+        ),
+      );
+      expect(room.lastEvent?.eventId, '123456');
+      expect(room.lastEvent?.type, EventTypes.Reaction);
     });
     test('lastEvent when reply parent edited', () async {
       room.setState(