Comment 3 for bug 1721929

We have void SetlogFeature::slotJoinWithPrevious() to join an old history with the current
The inner loop setting the played flag is at setlogfeature.cpp:214

A solution is to add context menu entry near setlogfeature.cpp:28
and introduce a new slot copying the slotJoinWithPrevious() solution, but removing the joining.

If there is a common part for both features, you may extract it as sub function, if you think it it worth to do.