If the region is active, join all the lines it spans

* lisp/simple.el (delete-indentation): Join lines in the active region.
(Bug#34796)

* doc/misc/org.texi: Describe the arguments of delete-indentation.

* etc/NEWS: Mention region support in delete-indentation.

1 files changed, 4 insertions, 0 deletions

diff --git a/doc/emacs/indent.texi b/doc/emacs/indent.texi
index a6aa75bbb42..61cf7332b5c 100644
--- a/doc/emacs/indent.texi
+++ b/doc/emacs/indent.texi
@@ -110,6 +110,10 @@ parentheses, or if the junction follows another newline.
 If there is a fill prefix, @kbd{M-^} deletes the fill prefix if it
 appears after the newline that is deleted.  @xref{Fill Prefix}.
 
+With the universal prefix argument, join the current line line to the
+following line.  With the region active, join lines in the region.  If
+both the argument is set and the region is active, the region is ignored.
+
 @item C-M-\
 @kindex C-M-\
 @findex indent-region