The clientX property of the originating pointer move event.
The clientY property of the originating pointer move event.
An app/client session identifier.
If a single client is communicating with multiple apps, it needs to be able
to tell which app is the source of any update messages. This session
identifier allows clients to do so. The default value is "default". But if
a client sends a PingPongMessage with a customized sessionId field,
that value will start appearing in these view state update messages.
The tag identifying this message type.
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A message sent by the app to enable drag operations over the app. The message is triggered when the pointer moves over the app with any button pressed.