Congratulations!  You may have unearthed a bug in Ediff!

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Increase verbosity of ediff-toggle-multiframe

* lisp/vc/ediff-util.el (ediff-toggle-multiframe):
Print out in the minibuffer the updated ediff frame mode.


Emacs  : GNU Emacs 25.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.28)
  of 2015-11-07
Package: Ediff 2.81.5 of July 4, 2013