Merge from origin/emacs-26

9254885 (origin/emacs-26) Resurrect display-line-number-mode in clien...
aecbbd5 * src/fns.c (Fmapconcat): Doc fix.  (Bug#35710)
8e5fc38 Fix typo
ee21b40 * lisp/term/w32-win.el ([noname]): Bind to 'ignore'.  (Bug#36...
f68b33f Fix styling of Unicode codepoints in manuals
ff7ec6f Fix a few uses of quotes in user manual
b67042b More minor copyedits in the Emacs manual
9734b5c Fix minor issues in the Emacs manual
c153250 Try to improve text on atomic windows in Elisp manual
fb314ba Don't recommend insert-before-markers in process filters

1 files changed, 6 insertions, 2 deletions

diff --git a/src/fns.c b/src/fns.c
index cb47b818f17..4bb525b89e9 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -2681,8 +2681,12 @@ mapcar1 (EMACS_INT leni, Lisp_Object *vals, Lisp_Object fn, Lisp_Object seq)
 DEFUN ("mapconcat", Fmapconcat, Smapconcat, 3, 3, 0,
        doc: /* Apply FUNCTION to each element of SEQUENCE, and concat the results as strings.
 In between each pair of results, stick in SEPARATOR.  Thus, " " as
-SEPARATOR results in spaces between the values returned by FUNCTION.
-SEQUENCE may be a list, a vector, a bool-vector, or a string.  */)
+  SEPARATOR results in spaces between the values returned by FUNCTION.
+SEQUENCE may be a list, a vector, a bool-vector, or a string.
+SEPARATOR must be a string.
+FUNCTION must be a function of one argument, and must return a value
+  that is a sequence of characters: either a string, or a vector or
+  list of numbers that are valid character codepoints.  */)
   (Lisp_Object function, Lisp_Object sequence, Lisp_Object separator)
 {
   USE_SAFE_ALLOCA;