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WIPING_TP

One limitation:

   A simple implementation of fixed string
   find-and-replace just deletes the old string and
   replaces it with the new: that wipes out all the
   text-properties on that string.

   A common idiom in perl substitutions is to include
   some context:

      s/The (.*?) in the/The Rat in the/

   The Cat in the
   |--|   |-----|

   Why wipe the tp on all of this?
   But it's hard to avoid.


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