Fix C-w in ivy not moving up directory

And ensure C-w doesn't affect kill-ring from minibuffer.

core/autoload/text.el

@@ -143,6 +143,13 @@ line to beginning of line. Same as `evil-delete-back-to-indentation'."
     (unless empty-line-p
       (indent-according-to-mode))))
 
+;;;###autoload
+(defun doom/delete-backward-word (arg)
+  "Like `backward-kill-word', but doesn't affect the kill-ring."
+  (interactive "p")
+  (let (kill-ring)
+    (backward-kill-word arg)))
+
 ;;;###autoload
 (defun doom/dumb-indent ()
   "Inserts a tab character (or spaces x tab-width)."