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static final class
The message is from a chat event log.
static final class
The message is from a chat history.
static final class
The message is from a chat list or a forum topic list.
static final class
The message is from a forum topic history.
static final class
The message is from chat, message thread or forum topic history
preview.
static final class
The message is from a message thread history.
static final class
The message is from a notification.
static final class
The message is from some other source.
static final class
The message was screenshotted; the source must be used only if the
message content was visible during the screenshot.
static final class
The message is from search results, including file downloads, local
file list, outgoing document messages, calendar.
Source of the message view; pass null to guess the source based on chat open state.
Informs TDLib that messages are being viewed by the user.