Make sure user keybindings are respected

* ivy.el: Make sure user keybindings are reused in ivy-minibuffer-map.
  Without this patch, if the user specifies his own keybinding for a
  standard command (e.g., `beginning-of-buffer`, normally bound to
  `M-<`), ivy keeps using the default keybinding (e.g., `M-<`) in
  ivy-minibuffer-map instead of the user-specified one.

* ivy-test.el: Add corresponding test

Fix issue abo-abo#466.

ivy-test.el

@@ -20,6 +20,10 @@
 ;; see <http://www.gnu.org/licenses/>.
 
 (require 'ert)
+
+;; useful for #'ivy-read-remap. It must arrive before (require 'ivy)
+(define-key global-map (kbd "<S-right>") #'end-of-buffer)
+
 (require 'ivy)
 (require 'counsel)
 
@@ -79,6 +83,12 @@
                      "can C-m")
            "can")))
 
+(ert-deftest ivy-read-remap ()
+  (should (equal
+           (ivy-with '(ivy-read "pattern: " '("blue" "yellow" "red"))
+                  "<S-right> C-m")
+           "red")))
+
 (ert-deftest swiper--re-builder ()
   (setq swiper--width 4)
   (should (string= (swiper--re-builder "^")

ivy.el

@@ -223,25 +223,25 @@ Example:
     (define-key map (kbd "C-j") 'ivy-alt-done)
     (define-key map (kbd "C-M-j") 'ivy-immediate-done)
     (define-key map (kbd "TAB") 'ivy-partial-or-done)
-    (define-key map (kbd "C-n") 'ivy-next-line)
-    (define-key map (kbd "C-p") 'ivy-previous-line)
-    (define-key map (kbd "<down>") 'ivy-next-line)
-    (define-key map (kbd "<up>") 'ivy-previous-line)
+    (define-key map [remap next-line] 'ivy-next-line)
+    (define-key map [remap previous-line] 'ivy-previous-line)
+    (define-key map [remap next-line] 'ivy-next-line)
+    (define-key map [remap previous-line] 'ivy-previous-line)
     (define-key map (kbd "C-s") 'ivy-next-line-or-history)
     (define-key map (kbd "C-r") 'ivy-reverse-i-search)
     (define-key map (kbd "SPC") 'self-insert-command)
-    (define-key map (kbd "DEL") 'ivy-backward-delete-char)
-    (define-key map (kbd "M-DEL") 'ivy-backward-kill-word)
-    (define-key map (kbd "C-d") 'ivy-delete-char)
-    (define-key map (kbd "C-f") 'ivy-forward-char)
-    (define-key map (kbd "M-d") 'ivy-kill-word)
-    (define-key map (kbd "M-<") 'ivy-beginning-of-buffer)
-    (define-key map (kbd "M->") 'ivy-end-of-buffer)
+    (define-key map [remap backward-delete-char] 'ivy-backward-delete-char)
+    (define-key map [remap backward-kill-word] 'ivy-backward-kill-word)
+    (define-key map [remap delete-char] 'ivy-delete-char)
+    (define-key map [remap forward-char] 'ivy-forward-char)
+    (define-key map [remap kill-word] 'ivy-kill-word)
+    (define-key map [remap beginning-of-buffer] 'ivy-beginning-of-buffer)
+    (define-key map [remap end-of-buffer] 'ivy-end-of-buffer)
     (define-key map (kbd "M-n") 'ivy-next-history-element)
     (define-key map (kbd "M-p") 'ivy-previous-history-element)
     (define-key map (kbd "C-g") 'minibuffer-keyboard-quit)
-    (define-key map (kbd "C-v") 'ivy-scroll-up-command)
-    (define-key map (kbd "M-v") 'ivy-scroll-down-command)
+    (define-key map [remap scroll-up-command] 'ivy-scroll-up-command)
+    (define-key map [remap scroll-down-command] 'ivy-scroll-down-command)
     (define-key map (kbd "C-M-n") 'ivy-next-line-and-call)
     (define-key map (kbd "C-M-p") 'ivy-previous-line-and-call)
     (define-key map (kbd "M-q") 'ivy-toggle-regexp-quote)
@@ -250,14 +250,14 @@ Example:
     (define-key map (kbd "C-o") 'hydra-ivy/body)
     (define-key map (kbd "M-o") 'ivy-dispatching-done)
     (define-key map (kbd "C-M-o") 'ivy-dispatching-call)
-    (define-key map (kbd "C-k") 'ivy-kill-line)
+    (define-key map [remap kill-line] 'ivy-kill-line)
     (define-key map (kbd "S-SPC") 'ivy-restrict-to-matches)
-    (define-key map (kbd "M-w") 'ivy-kill-ring-save)
+    (define-key map [remap kill-ring-save] 'ivy-kill-ring-save)
     (define-key map (kbd "C-'") 'ivy-avy)
     (define-key map (kbd "C-M-a") 'ivy-read-action)
     (define-key map (kbd "C-c C-o") 'ivy-occur)
     (define-key map (kbd "C-c C-a") 'ivy-toggle-ignore)
-    (define-key map (kbd "C-h m") 'ivy-help)
+    (define-key map [remap describe-mode] 'ivy-help)
     map)
   "Keymap used in the minibuffer.")
 (autoload 'hydra-ivy/body "ivy-hydra" "" t)