chore: Only load last event sender if necessary

lib/pages/chat_list/chat_list_item.dart

@@ -89,6 +89,11 @@ class ChatListItem extends StatelessWidget {
     if (filter != null && !displayname.toLowerCase().contains(filter)) {
       return const SizedBox.shrink();
     }
+
+    final needLastEventSender = lastEvent == null
+        ? false
+        : room.getState(EventTypes.RoomMember, lastEvent.senderId) == null;
+
     return Padding(
       padding: const EdgeInsets.symmetric(
         horizontal: 8,
@@ -226,12 +231,21 @@ class ChatListItem extends StatelessWidget {
                             maxLines: 1,
                             softWrap: false,
                           )
-                        : Text(
-                            room.membership == Membership.invite
-                                ? isDirectChat
-                                    ? L10n.of(context)!.invitePrivateChat
-                                    : L10n.of(context)!.inviteGroupChat
-                                : room.lastEvent?.calcLocalizedBodyFallback(
+                        : FutureBuilder(
+                            future: needLastEventSender
+                                ? room.lastEvent?.calcLocalizedBody(
+                                    MatrixLocals(L10n.of(context)!),
+                                    hideReply: true,
+                                    hideEdit: true,
+                                    plaintextBody: true,
+                                    removeMarkdown: true,
+                                    withSenderNamePrefix: !isDirectChat ||
+                                        directChatMatrixId !=
+                                            room.lastEvent?.senderId,
+                                  )
+                                : null,
+                            initialData:
+                                room.lastEvent?.calcLocalizedBodyFallback(
                               MatrixLocals(L10n.of(context)!),
                               hideReply: true,
                               hideEdit: true,
@@ -240,7 +254,13 @@ class ChatListItem extends StatelessWidget {
                               withSenderNamePrefix: !isDirectChat ||
                                   directChatMatrixId !=
                                       room.lastEvent?.senderId,
-                                    ) ??
+                            ),
+                            builder: (context, snapshot) => Text(
+                              room.membership == Membership.invite
+                                  ? isDirectChat
+                                      ? L10n.of(context)!.invitePrivateChat
+                                      : L10n.of(context)!.inviteGroupChat
+                                  : snapshot.data ??
                                       L10n.of(context)!.emptyChat,
                               softWrap: false,
                               maxLines: 1,
@@ -256,6 +276,7 @@ class ChatListItem extends StatelessWidget {
                               ),
                             ),
                           ),
+                  ),
                   const SizedBox(width: 8),
                   AnimatedContainer(
                     duration: FluffyThemes.animationDuration,