Crash by editing lines backwards when extend over the following system

GIT commit: 51c3e43 / Windows10

1) "Untitled" score
2) Enter a few notes and a slur

• The test file at this step: slur back system.mscz

3) Double-click for enter in edit mode
4) Press Shift + right arrow until the slur extends over the second system (one measure is enough)
5) Ctrl + left arrow (or simply: left arrow)

Result: crash