Consider making ToolTip's timeout begin only when fully opened

import QtQuick 2.15
import QtQuick.Controls 2.15

ApplicationWindow {
    width: 400
    height: 400
    visible: true

    Button {
        id: button
        text: "Button"

        ToolTip {
            parent: button
            visible: button.pressed
            text: "Test"
            timeout: 500

            onOpened: print("opened")
            onAboutToHide: print("aboutToHide")
            onClosed: print("closed")

            enter: Transition {
                NumberAnimation { property: "opacity"; from: 0.0; to: 1.0; easing.type: Easing.OutQuad; duration: 1000 }
            }
        }
    }
}