Comment 8 for bug 755842

Yep, I believe it's the same sort of issue.
Both are caused by the window shadow/border being detected as the edge of the window, so it is acting as if the window is wider & taller than it actually is.

In that case, it's auto-hiding the launcher as it's sitting under the launcher from a wrapped window.

I can see three solutions (none of which I know how to implemenent):
1) Disable window shadows/borders completely
2) Make the shadows/borders external to the window dimensions so they aren't taken into account like they currently are
3) Stop workspaces from wrapping directly into each other