It seems wrong to me, because when you scroll down over the sound indicator, which was also got an update at the same time in bug #1342731, the cursor moves left. So it should move left when scrolling down over the switcher.
Also there's a chance that this behaviour change was a mistake, since it was back-ported in an SRU, and the Regression Potential explicitly said, "Vertical scrolling code has not been touched by the change, so there's no possibility to regress in this sense."
It seems wrong to me, because when you scroll down over the sound indicator, which was also got an update at the same time in bug #1342731, the cursor moves left. So it should move left when scrolling down over the switcher.
Also there's a chance that this behaviour change was a mistake, since it was back-ported in an SRU, and the Regression Potential explicitly said, "Vertical scrolling code has not been touched by the change, so there's no possibility to regress in this sense."