Thanks for your bug report. This is indeed related to the fix mentioned by maroon.
The current fix sets both EM_SETTARGETDEVICE and a unicode character to fix the text-wrapping issue. If I disable the use of EM_SETTARGETDEVICE, the unicode insertion seems to resolve the text-wrap issue sufficiently well and the horizontal scrollbar is back to normal, so I will use this in the next beta to see how it works out.
