new gnumeric
write a really, really long formulas.
edit that formula
If the formula was long enough, the editable item-edit spans several rows. 
Now try to select text that spans several rows. 
While the edit box at the top of the page shows the selection correctly,
the selection in the item-edit is incorrect. It appears that you only see a selection in the first row using the horizontal start and end positions of the true selection.

So sometimes (if the endpoint is to the left (but in a later row) of the start point) text is selected that shouldn't and text in teh second and later rows is never selected.