fix(evil): persist evil state after mode changes

For example: when doom-guess-mode-h is triggered (see #7141), or when
the user invokes a mode function through M-x.

Fix: #7141

modules/editor/evil/config.el

@@ -55,6 +55,14 @@ directives. By default, this only recognizes C directives.")
               ((modulep! :emacs undo) 'undo-fu)
               ((> emacs-major-version 27) 'undo-redo)))
 
+  ;; Fix #7141
+  (defadvice! +evil--persist-state-a (fn &rest args)
+    "When changing major modes, Evil's state is lost. This advice preserves it."
+    :around #'set-auto-mode
+    (if evil-state
+        (evil-save-state (apply fn args))
+      (apply fn args)))
+
   ;; Slow this down from 0.02 to prevent blocking in large or folded buffers
   ;; like magit while incrementally highlighting matches.
   (setq-hook! '(magit-mode-hook so-long-minor-mode-hook)