bug#15332: Keystrokes's immediate echo only works every other time

[Stefan Monnier]

Package: Emacs
Version: 24.3.50


If you do:

   C-u <wait> 5 5 5 5 ...

You'll see keystrokes echo as follows:

   C-u-          (correct)
   C-u 5         (instead of "C-u 5-")
   C-u 5 5-      (only appears after you wait echo-keystrokes seconds)
   C-u 5 5 5     (instead of "C-u 5 5 5-")
   C-u 5 5 5 5-  (only appears after you wait echo-keystrokes seconds)
   ...

This worked correctly in 22.3 but is broken at least since 23.4.
   

        Stefan