update

Description:

public bool update (string summary, string? body, string? icon)

Updates the notification text and icon.

This won't send the update out and display it on the screen. For that, you will need to call [method@Notification.show].

this	The notification to update.
summary	The new required summary text.
body	The optional body text.
icon	The optional icon theme icon name or filename.

true, unless an invalid parameter was passed.