editing/deleting/delete-ws-fixup-002.html illustrates a bug where a space is collapsed incorrectly after deletion.
The space replaced with a nbsp, so it shouldn't be collapsed. Re-sizing the window makes it appear, this is a Layout and Rendering bug.
I just ran editing/deleting/delete-ws-fixup-002.html in Safari 4 and it appears that this bug is fixed. Closing.