bug#49331: query-replace: commands too easy to enter the document

[積丹尼 Dan Jacobson]

A little problem with query-replace is after the last match, the
   "Type Space or ‘y’ to replace one match, Delete or ‘n’ to skip to next,"
start polluting the document. E.g., the Deletes start eating characters.
If one isn't careful one might have gobbled a character or two off the en