Score view after close left-most tab and crash (0.9.6 regression)

1. Open three scores in MuseScore. Right-most tab should be in focus
2. Close left-most tab using the red X (and not switching focus)

Expected behavior: Left-most tab should close and the score from the right-most tab should remain on display

Actual behavior: Left-most tab closes but the right-most tab displays the score that you just closed.

(Tested using r.2412 nightly, Windows XP)