musescore/MuseScore — pull request #1080 by MarcSabatella (2014-07-30 22:45:56+00:00)
Title: fix #28476: disable systemFlag for chord symbols

Supporting the System flag for chord symbols does not really make sense, since the chord would need to be transposed differently for each staff, despite only being displayed on one staff of the score. Better to simply disable it.