This message delimits mouse button click events. Between a button-down and a button-up event the mouse is considered to be dragging. A mouse click is considered to happen on button-down, and dragging is terminated by a button-up.

Margin Mouse Event

All mouse events in a margin cause the MLE to send a MLN_MARGIN notification to the owner window of the MLE. This message has, as its parameters, the original mouse message. The owner can process the notification or not. If the owner does not process the message, the event is treated as if it occurred on the closest point in the text.

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