[Room] Fix the requestHistory query.

lib/src/Room.dart

@@ -106,7 +106,7 @@ class Room {
     this.avatar,
     this.notificationCount,
     this.highlightCount,
-    this.prev_batch,
+    this.prev_batch = "",
     this.draft,
     this.unread,
     this.fullyRead,
@@ -295,8 +295,8 @@ class Room {
   Future<void> requestHistory({int historyCount = 100}) async {
     final dynamic resp = await client.connection.jsonRequest(
         type: "GET",
-        action: "/client/r0/rooms/$id/messages",
-        data: {"from": prev_batch, "dir": "b", "limit": historyCount});
+        action:
+            "/client/r0/rooms/$id/messages?from=${prev_batch}&dir=b&limit=$historyCount");
 
     if (resp is ErrorResponse) return;
 

test/FakeMatrixApi.dart

@@ -31,8 +31,11 @@ class FakeMatrixApi extends MockClient {
   FakeMatrixApi()
       : super((request) async {
           // Collect data from Request
-          final String action = request.url.path.split("/_matrix")[1];
+          String action =
+              request.url.path.split("/_matrix")[1] + "?" + request.url.query;
+          if (action.endsWith("?")) action = action.replaceAll("?", "");
           final String method = request.method;
+          print("Got action: $action");
           final dynamic data =
               method == "GET" ? request.url.queryParameters : request.body;
           var res = {};
@@ -76,7 +79,8 @@ class FakeMatrixApi extends MockClient {
             "origin_server_ts": 1432735824653,
             "unsigned": {"age": 1234}
           },
-      "/client/r0/rooms/!1234:example.com/messages": (var req) => {
+      "/client/r0/rooms/!1234:example.com/messages?from=1234&dir=b&limit=100":
+          (var req) => {
                 "start": "t47429-4392820_219380_26003_2265",
                 "end": "t47409-4357353_219380_26003_2265",
                 "chunk": [

test/Timeline_test.dart

@@ -41,7 +41,7 @@ void main() {
     client.connection.httpClient = FakeMatrixApi();
     client.homeserver = "https://fakeServer.notExisting";
 
-    Room room = Room(id: roomID, client: client);
+    Room room = Room(id: roomID, client: client, prev_batch: "1234");
     Timeline timeline = Timeline(
         room: room,
         events: [],