Don't insert list item if here is in code block

CHANGES.md

@@ -33,6 +33,7 @@
     - Mark `markdown-css-paths` safe as file local variables [GH-834][]
     - Resolve style sheets in `markdown-css-paths` relative to the Markdown file
       (if the path starts with `./` or `../`) [GH-855][] [GH-870][]
+    - Don't insert list item in code block [GH-841][]
 
   [gh-780]: https://github.com/jrblevin/markdown-mode/issues/780
   [gh-802]: https://github.com/jrblevin/markdown-mode/issues/802
@@ -43,6 +44,7 @@
   [gh-834]: https://github.com/jrblevin/markdown-mode/issues/834
   [gh-838]: https://github.com/jrblevin/markdown-mode/issues/838
   [gh-839]: https://github.com/jrblevin/markdown-mode/issues/839
+  [gh-841]: https://github.com/jrblevin/markdown-mode/issues/841
   [gh-845]: https://github.com/jrblevin/markdown-mode/issues/845
   [gh-848]: https://github.com/jrblevin/markdown-mode/issues/848
   [gh-855]: https://github.com/jrblevin/markdown-mode/issues/855

markdown-mode.el

@@ -5188,6 +5188,7 @@ list simply adds a blank line)."
    (markdown-indent-on-enter
     (let (bounds)
       (if (and (memq markdown-indent-on-enter '(indent-and-new-item))
+               (not (markdown-code-block-at-point-p))
                (setq bounds (markdown-cur-list-item-bounds)))
           (let ((beg (cl-first bounds))
                 (end (cl-second bounds))

tests/markdown-test.el

@@ -2109,6 +2109,17 @@ See GH-245."
       (should (string-equal (buffer-string) "   -   [X] item\n\n"))
       (should (= (point) 18)))))
 
+(ert-deftest test-markdown-indentation/not-insert-list-item-in-code-block ()
+  "Don't insert new item if here is in code."
+  (let ((markdown-indent-on-enter 'indent-and-new-item))
+    (markdown-test-string "```
+  - foo
+```"
+      (forward-line)
+      (end-of-line)
+      (call-interactively #'markdown-enter-key)
+      (should-not (looking-back "- ")))))
+
 ;;; Markup hiding tests:
 
 (ert-deftest test-markdown-markup-hiding/italics-1 ()