Remove the "Generate a D-Bus message" checkbox and just do it.
Replaced "Show icon in notification area" and "Popup message together
with the icon" checkboxes with a single "Show notification when a new
message arrives" checkbox.
Re-show an unacknowledged notification message when additional new
messages arrive.
Replaced the "Default" action label in notification messages with
"Show $FOLDER_NAME" (e.g. "Show Inbox").
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