Workspace switcher doesn't snap windows

I'm testing 12.04 64-bit and Unity from PPA (as requested in Call for testing for this weekend). When I open the workspace switcher, and move windows from one workspace to another, they don't snap to workspace edges. This makes all sorts of problems:

1. if I want to place an application's window next to left edge of a workspace, it is very easy to miss the edge by a few pixels. If a window is placed even 1 pixel left too far, its left edge will be visible on another workspace. When I switch to another workspace (that has a 1-2 pixels of moved window), and I click on that application, I stay on the same workspace, instead of switching to another. Usually, this 1-2 pixels of a window isn't obvious, and the user might be confused why focus isn't switched (actually, it is, but the application is placed on 2 workspaces simultaneously).

2. There is a snapping available to place window just below the top panel, but it isn't working always. If I try to place window jut below the panel, snapping sometimes work, sometimes not, but I was unable to see why. If it doesn't snap, its easy to place window's titlebar jus below top panel, which can also be confusing.

3. it is very easy to place a window where the launcher sits. If a launcher isn't in autohide mode, part of the window will be covered by launcher and, thus, unusable until the window is moved. I think that launcher should also be visible in workspace switcher (or, at least, some indication of it), so that user could place a window on right position from first try.