[Store] Fix storage for sending events.

lib/src/Room.dart

@@ -171,6 +171,8 @@ class Room {
 
   Future<String> sendTextEvent(String message, {String txid = null}) async {
     final String type = "m.room.message";
+
+    // Create new transaction id
     String messageID;
     final int now = DateTime.now().millisecondsSinceEpoch;
     if (txid == null) {
@@ -182,7 +184,7 @@ class Room {
     EventUpdate eventUpdate =
         EventUpdate(type: "timeline", roomID: id, eventType: type, content: {
       "type": type,
-      "id": null,
+      "id": messageID,
       "sender": client.userID,
       "status": 0,
       "origin_server_ts": now,

lib/src/Store.dart

@@ -220,7 +220,11 @@ class Store {
       }
 
       // Save the event in the database
-
+      if ((status == 1 || status == -1) &&
+          eventUpdate.content["txid"] is String)
+        txn.rawUpdate("UPDATE Events SET status=?, id=?, WHERE id=?",
+            [status, eventContent["id"], eventUpdate.content["txid"]]);
+      else
         txn.rawInsert(
             "INSERT OR REPLACE INTO Events VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?)", [
           eventContent["event_id"],
@@ -233,6 +237,12 @@ class Store {
           json.encode(eventContent["content"]),
           status
         ]);
+
+      // Is there a transaction id? Then delete the event with this id.
+      if (eventUpdate.content.containsKey("unsigned") &&
+          eventUpdate.content["unsigned"]["transaction_id"] is String)
+        txn.rawDelete("DELETE FROM Events WHERE id=?",
+            [eventUpdate.content["unsigned"]["transaction_id"]]);
     }
 
     if (type == "history") return null;