Staff/Part dialog changes not dirty when activated via double click

1. Have a score with instrument names showing, make sure it is saved (no dirty indicator)
2. Double click the instrument name to open up the Staff/Parts dialog
3. Make any obvious change (for example change instrument, or staff lines or notehead scheme or...)
4. OK out of the dialog

Actual Result: Change is applied to score, but not a part of undo-history, score is not marked dirty
Expected Result: Change is applied to score, undoable and score is marked dirty

Workaround: Open the Staff/Parts dialog via right-click context menu in the staff and this works just fine.