Merge from origin/emacs-26

1d732d6 (origin/emacs-26) Fix gud-statement for pdb
91a68b5 ; * msdos/INSTALL: Add info about GCC versions.
7ddcc9a Document 'custom-group'
58f9e15 A minor addition to etc/DEBUG
4590414 Avoid errors in ispell.el when Enchant returns empty extra chars
d0d75f9 Make 'ispell-initialize-spellchecker-hook' work again
b90ce66 Handle selected_window change in prepare_menu_bars (Bug#31312)
79ad0b3 ; * INSTALL: Fix Emacs version number.  (Bug#31358)
91de88b Fix report-emacs-bug via mailclient on MS-Windows
f4b5ff2 Port collation tests to glibc 2.27

1 files changed, 7 insertions, 0 deletions

diff --git a/doc/lispref/customize.texi b/doc/lispref/customize.texi
index 7fea507fd03..4d88d7c8c98 100644
--- a/doc/lispref/customize.texi
+++ b/doc/lispref/customize.texi
@@ -257,6 +257,13 @@ customizable variable @code{custom-unlispify-remove-prefixes} is
 non-@code{nil}, the item's tag will omit @var{prefix}.  A group can
 have any number of prefixes.
 @end table
+
+@cindex @code{custom-group} property
+The variables and subgroups of a group are stored in the
+@code{custom-group} property of the group's symbol.  @xref{Symbol
+Plists}.  The value of that property is a list of pairs whose
+@code{car} is the variable or subgroup symbol and the @code{cdr} is
+either @code{custom-variable} or @code{custom-group}.
 @end defmac
 
 @defopt custom-unlispify-remove-prefixes