Pressing Option-Delete in a new text fields deletes the word before the caret, then one additional space before that word. Old text field (and Mac OS X) behavior is to delete only the word and not touch the leading space(s).
I've got a fix for this one.
Same underlying cause as bug 8063. *** This bug has been marked as a duplicate of 8063 ***
I was wrong, not a duplicate.
Same is true of any contenteditable, so this is not specific to the text fields.
The problem is simply that smartDeleteOK: gets passed YES and should get passed NO.
Created attachment 7432 [details] patch, including change log
Created attachment 7436 [details] patch, including detailed change log and a layout test
Verified in r13675 nightly.