On-Demand Sidebar on top screen edge leaves single pixel edge while collapsed
I have a dock along my top screen edge which is set to work as an on-demand sidebar. For some time now there has been a single pixel edge that remains in place even when the bar is collapsed (usually invisible but can be seen in certain fullscreen applications). This leads to me often clicking on tasks and applets when aiming for browser tabs, causing windows to change focus and applets to pop up.
I can't seem to attribute this to any settings having gone through them all so am assuming this is a bug. I've attached a dump of my layout if that helps. Let me know if you need any more info.