Instruments lose their clef if in the last note line showing of clef is disabled
GIT commit: 11892ff / Windows7
1) Load this test file: lute clef.mscz
(it's a new score for lute, with Tab type 6-str.French - so without clef by default, ditto for other historical Tab, ie Italian -, associate to another instrument, eg Voice
Result: as expected
2) Now, press "I" -> select the Voice staff, and click on Up arrow to do go up this Voice staff in first place -> Ok
Unexpected result: the Voice has lost its clef.