You often want to stop animation without restarting it fully, which can be accomplished with paused property.

Unfortunately following code will lead to

NumberAnimation {
    running: program.state
    paused: Qt.application.active
}

following unhelpful warnings

QML NumberAnimation: setPaused() cannot be used when animation isn't running

, forcing the developer to write boilerplate

NumberAnimation {
    running: program.state
    paused: running && Qt.application.active
}

While conceptually understandable not sure what is the value of coupling running and paused states so tightly together.

s