Table edit: pressing enter inserts new line in a different table cell

Sometimes when editing table cells a new line is inserted at the position of the last edit, not at the actual cursor position

Problem reproducible by following these steps:

• create a new page with only content

  |AB|CD
  

• edit the page in the WYSIWYG editor
• click with the mouse between the "A" and the "B" of the first table cell
• press space bar to insert a space
• click with the mouse between the "C" and the "D" of the second table cell
• press enter

expected behaviour: a new line is inserted between "C" and "D"
observed behaviour: a new line is inserted between "A" and "B"

The problem is only reproducible if clicking with the mouse into table cells. Using keyboard navigation to jump between cells prevents the problem. As soon as one crosses a table cell via cursor or tab keys, the problem vanishes. (Unfortunately some users seem to use mouse navigation exclusively ...)

I can produce the problem in IE9 and IE10, but not IE8