Fix bug in delete-indentation when region is inactive

* test/lisp/simple-tests.el: Add tests for delete-indentation.
(simple-delete-indentation-no-region): Works with no region.
(simple-delete-indentation-inactive-region): Was broken with inactive
region; now fixed.

* lisp/simple.el (delete-indentation): Check (use-region-p) before using BEG.

1 files changed, 2 insertions, 1 deletions

diff --git a/lisp/simple.el b/lisp/simple.el
index f52bd95bf84..f76f31ad146 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -617,7 +617,8 @@ region is ignored if prefix argument is given.)"
                                           (+ (point) (length fill-prefix)))))
           (delete-region (point) (+ (point) (length fill-prefix))))
       (fixup-whitespace)
-      (if (and beg
+      (if (and (use-region-p)
+               beg
                (not arg)
                (< beg (point-at-bol)))
           (beginning-of-line)))))