fix #281866: fix inability to correctly set loop markers in parts #5340
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Resolves: https://musescore.org/en/node/281866.
As playback is currently always performed for MasterScore, it would be logical to store the information about positions of playback cursor and loop markers in MasterScore rather than individual excerpt scores. This commit implements this approach and fixes the issue with inability to set loop markers from parts. Strictly speaking, only changing
Seq::setLoopSelection
is absolutely necessary to fix the issue, the approach with moving_pos
toMasterScore
allows to naturally avoid incorrect visual feedback due to markers positions information being not synchronized across scores and ScoreViews.