Quirky behaviour in bar selection in multimeasure rests

Steps to reproduce:
1.: create a new piano score with 32 bars
2.: put 4 quavers in the last bar
3.: check "create multimeasure rests"
4.: select last note in score and go backwards more than 4 times by pressing the left arrow button
5.: keep going left and press shift
6.: strange things: selection square in empty space or crash for me.

Platform: ubuntu 14.04. rev.: 3543170