Can't change target anchor using id selector (in link dialog)

[Marek Lewandowski]

1. open any sample with CKEditor (i.e. samples/replacebyclass.html)
2. use following source

   <p>Fancy link</p>
   
   <p>&nbsp;</p>
   
   <p><a id="a1" name="a1"></a></p>
   
   <p><a id="a2" name="a2"></a></p>
   

3. go back to wysiwyg mode
4. make following selection in first paragraph

   Fancy [link]
   

5. apply link using a Link button
6. change Link Type to " Link to anchor in the text"
7. in "By Element Id" select set value to: "a1"
8. click OK
9. open once more link dialog using a button
10. change the value of "By Element Id" to "a2"
11. click OK
12. open link dialog once more

Expected result:
"By Element Id" value should be changed to a2

Current result:
"By Element Id" stays with previous value