Bad screen scaling if staff scaled to 50% and zoom set to 200%

Ubuntu 14.04, GIT commit: de3a7c2

1) new score for one instrument with default settings (My First Score is fine)
2) right click staff, set Scale to 50%
3) set zoom to 200%

Result:

Presumably, the scale and zoom factor are cancelling each other out somehow in a way that is fooling the layout code. Similar results for Scale = 25%.

Interesting, the built in image capture got it right, even in screenshot mode; I had to take the screenshot with another tool to show the problem :-)