BACKSPACE positioning is wrong

[fredck]

At least with Firefox:

1. Load an empty editor (or click New Page).
2. With the focus in the editor, hit ENTER.
3. Hit BACKSPACE to return to the first paragraph.
4. Type "Test".

Note that the cursor moves one line to the bottom. The final output is:

<p>
	<br />
	Test</p>

[fredck]

Fixed with [4919].