query-replace-lazy-highlight

query-replace-lazy-highlight is a variable defined in `replace.el'.
Its value is

t

Documentation:
Controls the lazy-highlighting during query replacements.
When non-nil, all text in the buffer matching the current match
is highlighted lazily using isearch lazy highlighting (see
`lazy-highlight-initial-delay' and `lazy-highlight-interval').

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.