Revert undo-feature for multiple-cursors

re #169

README.md

@@ -185,7 +185,7 @@ Run the tests with:
 * [Fuco](https://github.com/Fuco1) added the first version of `mc/mark-all-like-this-dwim`
 * [Zach Kost-Smith](https://github.com/smithzvk) added `mc/mark-pop`
 * [Maciej Katafiasz](https://github.com/mathrick) added `mc/mark-all-dwim`
-* [Aleksey Fedotov](https://github.com/lexa) added `mc-hide-unmatched-lines-mode` and made undo restore your cursors after leaving mc-mode.
+* [Aleksey Fedotov](https://github.com/lexa) added `mc-hide-unmatched-lines-mode`
 
 Thanks!
 

features/multiple-cursors-core.feature

@@ -65,26 +65,6 @@ Feature: Multiple cursors core
     And I type "!"
     Then I should see "This text! contains the word text! twice"
 
-  Scenario: Undo mode
-    Given I have cursors at "text" in "This text contains the word text twice"
-    When I press "C-g"
-    And I press "M-f"
-    And I press "C-_"
-    And I type "!"
-    Then I should see "This !text contains the word !text twice"
-
-  Scenario: Undo until mc mode will be disabled
-    Given I have cursors at "text" in "This text contains the word text twice"
-    And I should have 2 cursors
-    When I press "C-g"
-    And I should have 1 cursors
-    And I press "C-_"
-    And I should have 2 cursors
-    And I press "C-_"
-    And I should have 1 cursors
-    And I type "!"
-    Then I should see "This !text contains the word text twice"
-
   Scenario: Setting and popping mark
     Given I have cursors at "text" in "This text contains the word text twice"
     And I press "C-SPC"

multiple-cursors-core.el

@@ -52,14 +52,6 @@
          (setq buffer-undo-list ;; otherwise add a function to activate this cursor
                (cons (cons 'apply (cons 'activate-cursor-for-undo (list id))) buffer-undo-list))))))
 
-
-(defun mc/get-all-fake-cursors-state ()
-  "Return list of all fake cursor states
-like this: ((CURSOR-POS MARK-POSITION (list of cursor specific variables)) ...)"
-  (mapcar (lambda (cursor)
-            (mc/get-state-from-overlay cursor))
-          (mc/all-fake-cursors)))
-
 (defun mc/all-fake-cursors (&optional start end)
   (remove-if-not 'mc/fake-cursor-p
                  (overlays-in (or start (point-min))
@@ -160,23 +152,6 @@ highlights the entire width of the window."
   (dolist (var mc/cursor-specific-vars)
     (when (boundp var) (set var (overlay-get o var)))))
 
-(defun mc/get-state-from-overlay (o)
-  "Return list describing state of cursor overlay"
-  (list
-   (marker-position (overlay-get o 'point))
-   (marker-position (overlay-get o 'mark))
-   (mapcar (lambda (var)
-             (when (boundp var) (cons var (overlay-get o var))))
-    mc/cursor-specific-vars)))
-
-(defun mc/create-overlay-from-state (point mark cursor-vars)
-  "Creates cursor overlay according to cursor-info"
-  (goto-char point)
-  (push-mark mark t)
-  (loop for (var . value) in cursor-vars
-        do (setq var value))
-  (mc/create-fake-cursor-at-point))
-
 (defun mc/remove-fake-cursor (o)
   "Delete overlay with state, including dependent overlays and markers."
   (set-marker (overlay-get o 'point) nil)
@@ -484,20 +459,6 @@ They are temporarily disabled when multiple-cursors are active.")
   :group 'multiple-cursors)
 (put 'mc/mode-line 'risky-local-variable t)
 
-(defun mc/restore-mode (real-cursor real-mark fake-cursors)
-  "Restore state of mc mode after undo"
-  (save-excursion
-    ;; remove all existing fake cursors
-    (when multiple-cursors-mode
-      (mc/remove-fake-cursors))
-    ;; and create set a new one
-    (mapc #'(lambda (cursor)
-              (apply 'mc/create-overlay-from-state cursor))
-          fake-cursors))
-  (goto-char real-cursor)
-  (push-mark real-mark t)
-  (multiple-cursors-mode t))
-
 ;;;###autoload
 (define-minor-mode multiple-cursors-mode
   "Mode while multiple cursors are active."
@@ -505,13 +466,11 @@ They are temporarily disabled when multiple-cursors are active.")
   (if multiple-cursors-mode
       (progn
         (mc/temporarily-disable-unsupported-minor-modes)
-        (push `(apply multiple-cursors-mode . ,(list 0)) buffer-undo-list)
         (add-hook 'pre-command-hook 'mc/make-a-note-of-the-command-being-run nil t)
         (add-hook 'post-command-hook 'mc/execute-this-command-for-all-cursors t t)
         (run-hooks 'multiple-cursors-mode-enabled-hook))
     (remove-hook 'post-command-hook 'mc/execute-this-command-for-all-cursors t)
     (remove-hook 'pre-command-hook 'mc/make-a-note-of-the-command-being-run t)
-    (push `(apply mc/restore-mode . ,(list (point) (mark) (mc/get-all-fake-cursors-state))) buffer-undo-list)
     (setq mc--this-command nil)
     (mc--maybe-set-killed-rectangle)
     (mc/remove-fake-cursors)