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Background set for the chat; may be null if none.
The new chat background; may be null if background was reset to default.
Chat(long id,
TdApi.ChatType type,
String title,
TdApi.ChatPhotoInfo photo,
TdApi.ChatPermissions permissions,
TdApi.Message lastMessage,
TdApi.ChatPosition[] positions,
TdApi.MessageSender messageSenderId,
TdApi.BlockList blockList,
boolean hasProtectedContent,
boolean isTranslatable,
boolean isMarkedAsUnread,
boolean hasScheduledMessages,
boolean canBeDeletedOnlyForSelf,
boolean canBeDeletedForAllUsers,
boolean canBeReported,
boolean defaultDisableNotification,
int unreadCount,
long lastReadInboxMessageId,
long lastReadOutboxMessageId,
int unreadMentionCount,
int unreadReactionCount,
TdApi.ChatNotificationSettings notificationSettings,
TdApi.ChatAvailableReactions availableReactions,
int messageAutoDeleteTime,
TdApi.ChatBackground background,
String themeName,
TdApi.ChatActionBar actionBar,
TdApi.VideoChat videoChat,
TdApi.ChatJoinRequestsInfo pendingJoinRequests,
long replyMarkupMessageId,
TdApi.DraftMessage draftMessage,
String clientData)
A new background was set in the chat.
The chat background was changed.