bug#46727: 27.1; Only the first function from prefix-command-echo-keystrokes-functions is used

[Miha Rihtaršič]

Greetings.

Looking at the function internal-echo-keystrokes-prefix, it is heavily
implied that all functions from
`prefix-command-echo-keystrokes-functions` should be used and their
return values concatenated. This isn't the case, however, because
`run-hook-wrapped` aborts on first non-nil returned value. The following
simple patch fixes this.

diff --git a/lisp/simple.el b/lisp/simple.el
index 1dfc3374ad..403861351c 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -4670,7 +4670,7 @@ internal-echo-keystrokes-prefix
     (setq prefix-command--last-echo
           (let ((strs nil))
             (run-hook-wrapped 'prefix-command-echo-keystrokes-functions
-                              (lambda (fun) (push (funcall fun) strs)))
+                              (lambda (fun) (push (funcall fun) strs) nil))
             (setq strs (delq nil strs))
             (when strs (mapconcat #'identity strs " "))))))

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