fix: Documents added in chat group not available for all members - EXO-78701. (#799)

Before this change, when Create chat group having more than 20 users then share a document in this chat and check uploaded documents permissions, only 18 users are listed in collaborators who can view the document. To fix this problem, change limit 20 to 0 when the limit is not specified to return all the room user list. After this change, all group members can open the uploaded document.

(cherry picked from commit 6976245)

Author: akhanfir

server-embedded/src/main/java/org/exoplatform/chat/server/ChatServer.java

@@ -1187,7 +1187,7 @@ protected void users(HttpServletRequest request, HttpServletResponse response) {
     }
 
     boolean showOnlyOnlineUsers = StringUtils.isNotBlank(onlineOnly) && "true".equals(onlineOnly);
-    int limit = StringUtils.isNumeric(limitString) ? Integer.parseInt(limitString) : 20;
+    int limit = StringUtils.isNumeric(limitString) ? Integer.parseInt(limitString) : 0;
     List<String> onlineUserList = StringUtils.isNotBlank(onlineUsers) ? Arrays.asList(onlineUsers.split(",")) : null;
     List<UserBean> users = userService.getUsers(room, onlineUserList, filter, limit, showOnlyOnlineUsers);
     if (StringUtils.isNotBlank(user)) {