DMG opened Finder window improvements

The Finder window that opens from the installer DMG usually looks fine.

In some circumstances it remains completely usable but could be tidier:

1) When the Status bar is visible, the space required for the icons then makes the scrollbar visible. This shouldn't be necessary -- just need to enlarge the window that opens slightly.

2) When hidden folders are visible, the hidden .background folder that contains the background image appears half in and half out of the window. This should be moved to completely out of the window. This will probably make the scrollbar appear, but the re-sizing from 1) should mean this doesn't even partially obscure anything else.