Comment 1 for bug 1667914

The problem with doing that is the question becomes, where to insert the
original word in the list? If you insert it at the top, it is
sub-optimal for words where the suggestions are useful, if you insert it
at the bottom, it becomes painful for the use case you describe -- of
the suggestions list having lots of incorrect entries.

Also, I'm not actually clear on the utility of this. For the use case
you describe -- using a spell checker in a book with lots of domain
special words -- wouldn't the most common operation be to add the word
to the ignored list or a user dictionary? This is not affected by the
suggestions list at all.