Notification: ignore seen notifications

app/src/main/java/com/keylesspalace/tusky/components/notifications/NotificationFetcher.kt

@@ -77,6 +77,11 @@ class NotificationFetcher @Inject constructor(
                             account,
                             index == 0
                         )
+
+                        // Pleroma extension: don't notify about seen notifications
+                        if (notification.pleroma?.seen == true)
+                            return
+
                         notificationManager.notify(notification.id, account.id.toInt(), androidNotification)
                         // Android will rate limit / drop notifications if they're posted too
                         // quickly. There is no indication to the user that this happened.

app/src/main/java/com/keylesspalace/tusky/entity/Notification.kt

@@ -20,6 +20,7 @@ import com.google.gson.JsonDeserializationContext
 import com.google.gson.JsonDeserializer
 import com.google.gson.JsonElement
 import com.google.gson.JsonParseException
+import com.google.gson.annotations.SerializedName
 import com.google.gson.annotations.JsonAdapter
 import com.keylesspalace.tusky.R
 
@@ -28,7 +29,8 @@ data class Notification(
     val id: String,
     val account: TimelineAccount,
     val status: Status?,
-    val report: Report?
+    val report: Report?,
+    val pleroma: PleromaNotification? = null,
 ) {
 
     /** From https://docs.joinmastodon.org/entities/Notification/#type */
@@ -86,6 +88,10 @@ data class Notification(
         }
     }
 
+    data class PleromaNotification(
+        @SerializedName("is_seen") val seen: Boolean
+    )
+
     override fun hashCode(): Int {
         return id.hashCode()
     }