feat(undo): add vundo

Close: #6263

modules/emacs/undo/config.el

@@ -48,6 +48,15 @@
             (undo-fu-session--file-name-ext))))
 
 
+(use-package! vundo
+  :unless (modulep! +tree)
+  :defer t
+  :config
+  (setq vundo-glyph-alist vundo-unicode-symbols
+        vundo-compact-display t)
+  (define-key vundo-mode-map [remap doom/escape] #'vundo-quit))
+
+
 (use-package! undo-tree
   :when (modulep! +tree)
   ;; Branching & persistent undo

modules/emacs/undo/packages.el

@@ -4,4 +4,6 @@
 (if (modulep! +tree)
     (package! undo-tree :pin "16f4121032d09ef44b3d7d02c4d02c3c2f18041f")
   (package! undo-fu :pin "0e22308de8337a9291ddd589edae167d458fbe77")
-  (package! undo-fu-session :pin "7b3fd0647dd1fbd02101eec61440e6d44953bcd9"))
+  (package! undo-fu-session :pin "7b3fd0647dd1fbd02101eec61440e6d44953bcd9")
+  (when (> emacs-major-version 27)  ; unsupported in 27
+    (package! vundo :pin "d78b02ab89955f3a3273884f6d799889a2ef6b6f")))