bug#36260: 27.0.50; isearchb should be reimplemented without iswitchb

[Richard Stallman]

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  > iswitchb is an obsolete package, but isearchb is implemented on top of
  > it.  It should be possible to reimplement it on top of any of the
  > un-obsoleted completion packages (like ido), but it's a complete
  > reimplementation:

We could declare isearchb obsolete.
We could declare iswitchb not obsolete.

-- 
Dr Richard Stallman
President, Free Software Foundation (https://gnu.org, https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)