Ah, didn't saw it has been reported before, so i second that first post! 8)
Only a little feature request:
The text in the warning dialog is a little unclear, one always needs to read the whole text to get the real question (of course after some time you are used to it).
However, i would suggest to place the question in the beginning and the explanation afterwards. And i would also label the button with "Delete" and "Keep" instead of "Yes" and "No", this would make the query much more clearly.
TIA
Tom