Slur handle selection doesn't jump to next line (0.9.6 regression)

To reproduce in r2624:
-Open any score with more than one line
-Click on a note towards the end of the first line and hit Ctrl+S to create a slur
-Hit Shift+Right a few times until the slur should jump to the next line
-A slur will be created, but the handle of the upper slur will still be selected instead of that of the slur on the next line