Strange result when merging cells in tables

[Helmø2]

I get a strange result i Chrome when making a 3x3 table with first row and first column set as header and then merging the middle cell of the first row down!

See attached screenshot from your http://ckeditor.com/demo page

I have entered the values a, b, c, ... , i ind the cells to start with (a, b and c being the first row, d, e and f being the values of the second row, etc). As expected the value b and e are then merged into the same cell - but the structure of the table now looks funny. I guess this is because the first row is a header row and the second row (middle cell) is not...?

[j.swiderski]

Issue has been reproducible in all browsers from CKEditor 3.1.

To reproduce:

1. insert table 3x3 with both headers.
2. fill it in with values from 1 to 9
3. Go to cell 2, right-click -> Cell -> Merge Down

Result: Cell 2 will be joined with cell 5. Additionally cell 4 and 6 will be mowed left. There is a slight difference between how cells are rendered in Webkit and other browsers (See Webkit.png and others.png).