Changing measure actual duration shifts all subsequent spanners

MuseScore b83bb6292d

1. Create a simple score with 4 quarter notes in the second measure and a slur spanning the 3 first ones or open the attached file
2. Right click the first measure and change the actual duration to 3/4

Actual result: the slur now spans from the 2nd quarter to the 4th
Expected result: the slur doesn't move and spans from the 1st quarter to the third.

Discussion:
Change actual duration of measure should probably call insertTime() and move the spanners, the keysig, clef events etc...