Fix evil-org's o/O in nested plain lists

Thanks by @fuxialexander

modules/lang/org/autoload/org.el

@@ -427,3 +427,14 @@ with `org-cycle')."
   "Auto-align table under cursor and re-calculate formulas."
   (when (eq major-mode 'org-mode)
     (+org|realign-table-maybe)))
+
+;;;###autoload
+(defun +org*evil-org-open-below (orig-fn count)
+  "Fix o/O creating new list items in the middle of nested plain lists. Only has
+an effect when `evil-org-special-o/O' has `item' in it (not the default)."
+  (cl-letf (((symbol-function 'end-of-visible-line)
+             (lambda ()
+               (org-end-of-item)
+               (backward-char 1)
+               (evil-append nil))))
+    (funcall orig-fn count)))

modules/lang/org/config.el

@@ -255,6 +255,10 @@ between the two."
   (add-hook! 'org-tab-first-hook #'(+org|indent-maybe +org|yas-expand-maybe))
   ;; Tell `doom/delete-backward-char' to respect org tables
   (add-hook 'doom-delete-backward-functions #'+org|delete-backward-char)
+  ;; Don't split current tree on M-RET
+  (setq org-M-RET-may-split-line nil
+        ;; insert new headings after current subtree rather than inside it
+        org-insert-heading-respect-content t)
   ;; Custom keybinds
   (define-key! org-mode-map
     (kbd "C-c C-S-l") #'+org/remove-link
@@ -272,6 +276,10 @@ between the two."
   (add-hook 'org-tab-first-hook #'+org|toggle-only-current-fold t)
   ;; Fix newline-and-indent behavior in src blocks
   (advice-add #'org-return-indent :after #'+org*return-indent-in-src-blocks)
+  ;; Fix o/O creating new list items in the middle of nested plain lists. Only
+  ;; has an effect when `evil-org-special-o/O' has `item' in it (not the
+  ;; default).
+  (advice-add #'evil-org-open-below :around #'+org*evil-org-open-below)
   ;; Undo `evil-collection-outline'
   (evil-define-key* 'normal outline-mode-map
     "^" nil