Wrap kill-region with defadvice from crux (#1035)

core/prelude-editor.el

@@ -197,12 +197,7 @@ The body of the advice is in BODY."
 ;; note - this should be after volatile-highlights is required
 ;; add the ability to cut the current line, without marking it
 (require 'rect)
-(defadvice kill-region (before smart-cut activate compile)
-  "When called interactively with no active region, kill a single line instead."
-  (interactive
-   (if mark-active (list (region-beginning) (region-end) rectangle-mark-mode)
-     (list (line-beginning-position)
-           (line-beginning-position 2)))))
+(crux-with-region-or-line kill-region)
 
 ;; tramp, for sudo access
 (require 'tramp)