emacs-27 c8fa056 1/2: Mention undo-amalgamate-change-group in the lispref manual

[Eli Zaretskii]

branch: emacs-27
commit c8fa056a50586429be37fc5bfde8226c4b6cefa2
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Mention undo-amalgamate-change-group in the lispref manual
    
    * doc/lispref/text.texi (Atomic Changes): Mention
    undo-amalgamate-change-group (bug#42303).
    
    (cherry picked from commit ba25a82855a2c03c25fec83f3056c166b692e94f)
---
 doc/lispref/text.texi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/doc/lispref/text.texi b/doc/lispref/text.texi
index 06975f7..5eead42 100644
--- a/doc/lispref/text.texi
+++ b/doc/lispref/text.texi
@@ -5561,6 +5561,11 @@ This function cancels and undoes all the changes in the 
change group
 specified by @var{handle}.
 @end defun
 
+@defun undo-amalgamate-change-group
+Amalgamate changes in change-group since @var{handle}.  I.e., remove
+all undo boundaries between the state of @var{handle} and now.
+@end defun
+
   Your code should use @code{unwind-protect} to make sure the group is
 always finished.  The call to @code{activate-change-group} should be
 inside the @code{unwind-protect}, in case the user types @kbd{C-g}