IE, FF: Delete/backspace keys remove anchor instead of joining paragraphs

[helsom]

Assume you have the following content within the ckeditor:

    <p>This is</p>
    <p>[anchor] an anchor</p>

Where [anchor] is the anchor placeholder.

Placing the cursor at the end of the first paragraph and hitting the DELETE key causes the anchor to be removed whereas I would expect that the second paragraph would be merged into the first paragraph and the anchor retained. [IE9 and FF10]

Placing the cursor at the beginning of the second paragraph, and hitting the BACKSPACE key also removes the anchor. [IE9]

This seems to work as expected on Chrome (WebKit).

I tried this on the following nightly build sample, and it still seems to be an issue: ​http://nightly.ckeditor.com/7385/_samples/replacebyclass.html

Incidentally, hitting the ENTER key immediately before an anchor on this nightly build seems to cause the anchor to get vertically squished (see screenshot).

[helsom]

IE9 Squished Anchor on ENTER key

[j.swiderski]

Sample code:

<p>
	This is</p>
<p>
	<a name="abc"></a>&nbsp;an anchor</p>

Reproducible form CKEditor 3.6 in Firefox and IE