D13099: piano_composition, add undo feature

[Johnny Jazeix]

jjazeix accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R2 GCompris

REVISION DETAIL
  https://phabricator.kde.org/D13099

To: amankumargupta, #gcompris_activities, jjazeix
Cc: kde-edu, #gcompris_activities, himanshuvishwakarma, harrymecwan, ganeshredcobra, nityanandkumar, echarruau, rahulyadav, narvaez, scagarwal, apol, timotheegiet, hkaelberer, jjazeix, bcoudoin
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