RE: History for query replace pairs

[Herring, Davis]

> Then the user has to be careful to not remove the arrow
> while editing the inserted values in the minibuffer.
> 
> Another problem is how to parse such format
> when a from/to value contains the arrow "->"
> 
>   Query replace (default from1 -> to1): from2 -> from2 -> to2 -> to2

This part, at least, is easy: give the -> a text property to make it 
recognizable (and, while you're at it, a display property so that it's really 
one character if the user does decide to delete it).

Davis