Merge branch 'main' into td/codecov

lib/src/client.dart

@@ -2988,9 +2988,6 @@ class Client extends MatrixApi {
           chatUpdate.unreadNotifications?.notificationCount ?? 0;
       rooms[roomIndex].highlightCount =
           chatUpdate.unreadNotifications?.highlightCount ?? 0;
-      if (chatUpdate.timeline?.prevBatch != null) {
-        rooms[roomIndex].prev_batch = chatUpdate.timeline?.prevBatch;
-      }
 
       final summary = chatUpdate.summary;
       if (summary != null) {

lib/src/event.dart

@@ -792,7 +792,13 @@ class Event extends MatrixEvent {
         throw ('Unable to decrypt file');
       }
     }
-    return MatrixFile(bytes: uint8list, name: body);
+
+    final filename = content.tryGet<String>('filename') ?? body;
+    return MatrixFile(
+      bytes: uint8list,
+      name: filename,
+      mimeType: attachmentMimetype,
+    );
   }
 
   /// Returns if this is a known event type.

lib/src/room.dart

@@ -744,6 +744,8 @@ class Room {
                     'msgtype': file.msgType,
                     'body': file.name,
                     'filename': file.name,
+                    'info': file.info,
+                    if (extraContent != null) ...extraContent,
                   },
                   type: EventTypes.Message,
                   eventId: txid,
@@ -1322,7 +1324,6 @@ class Room {
     );
 
     if (onHistoryReceived != null) onHistoryReceived();
-    this.prev_batch = resp.end;
 
     Future<void> loadFn() async {
       if (!((resp.chunk.isNotEmpty) && resp.end != null)) return;
@@ -1363,13 +1364,14 @@ class Room {
                 : null,
           ),
         ),
-        direction: Direction.b,
+        direction: direction,
       );
     }
 
     if (client.database != null) {
       await client.database?.transaction(() async {
-        if (storeInDatabase) {
+        if (storeInDatabase && direction == Direction.b) {
+          this.prev_batch = resp.end;
           await client.database?.setRoomPrevBatch(resp.end, id, client);
         }
         await loadFn();

lib/src/utils/matrix_file.dart

@@ -41,9 +41,10 @@ class MatrixFile {
   }
 
   MatrixFile({required this.bytes, required String name, String? mimeType})
-      : mimeType = mimeType ??
-            lookupMimeType(name, headerBytes: bytes) ??
-            'application/octet-stream',
+      : mimeType = mimeType != null && mimeType.isNotEmpty
+            ? mimeType
+            : lookupMimeType(name, headerBytes: bytes) ??
+                'application/octet-stream',
         name = name.split('/').last;
 
   /// derivatives the MIME type from the [bytes] and correspondingly creates a