Slur position not updated after timesig change

Ubuntu Studio 14.04, GIT commit: 010d395

1) new score, 4/4, 32 measures
2) second measure, enter two half notes
3) add slur
4) change time signature to 3/4 (or 2/4)

Result: the notes & rests update correctly, but the slur stays in its old position on the page - which will now be too far to the left since the notes will have moved to the right.

This does *not* seem to be related to the recent timesig / map change - I can reproduce it in a build going back farther than that. I guess it's more likely related to recent slur changes.