fix: fix hr after list (#2809)

src/rules.js

@@ -26,7 +26,7 @@ export const block = {
     + ')',
   def: /^ {0,3}\[(label)\]: *(?:\n *)?([^<\s][^\s]*|<.*?>)(?:(?: +(?:\n *)?| *\n *)(title))? *(?:\n+|$)/,
   table: noopTest,
-  lheading: /^((?:.|\n(?!\n))+?)\n {0,3}(=+|-+) *(?:\n+|$)/,
+  lheading: /^((?:(?!^bull ).|\n(?!\n|bull ))+?)\n {0,3}(=+|-+) *(?:\n+|$)/,
   // regex template, placeholders will be replaced according to different paragraph
   // interruption rules of commonmark and the original markdown spec:
   _paragraph: /^([^\n]+(?:\n(?!hr|heading|lheading|blockquote|fences|list|html|table| +\n)[^\n]+)*)/,
@@ -64,6 +64,10 @@ block.html = edit(block.html, 'i')
   .replace('attribute', / +[a-zA-Z:_][\w.:-]*(?: *= *"[^"\n]*"| *= *'[^'\n]*'| *= *[^\s"'=<>`]+)?/)
   .getRegex();
 
+block.lheading = edit(block.lheading)
+  .replace(/bull/g, block.bullet) // lists can interrupt
+  .getRegex();
+
 block.paragraph = edit(block._paragraph)
   .replace('hr', block.hr)
   .replace('heading', ' {0,3}#{1,6} ')

test/specs/new/incorrectly_formatted_list_and_hr.html

@@ -0,0 +1,36 @@
+<ul>
+  <li>this is a list, not a heading</li>
+</ul>
+<hr />
+
+<ol>
+  <li>this is also a list</li>
+</ol>
+<ul>
+  <li>it should be a list</li>
+</ul>
+<ul>
+  <li>not heading</li>
+</ul>
+<hr />
+
+<p><s>not heading</s></p>
+<ul>
+  <li>this is also a list, not a multiline heading</li>
+</ul>
+<hr />
+
+<p><a href="/index.jpg">click here</a></p>
+<ul>
+  <li>this has to be a list</li>
+  <li>true...</li>
+</ul>
+<hr />
+
+<h2 id="heading--this-one-is-a-heading">
+  <b>heading</b> -this one is a heading
+</h2>
+
+<h2 id="heading---this-is-a-heading-too">
+  <b>heading</b> - this is a heading too
+</h2>

test/specs/new/incorrectly_formatted_list_and_hr.md

@@ -0,0 +1,23 @@
+- this is a list, not a heading
+-----
+
+1) this is also a list
+* it should be a list
+- not heading
+-----
+
+<s>not heading</s>
+- this is also a list, not a multiline heading
+*****
+
+[click here](/index.jpg)
+- this has to be a list
+- true...
+_____
+
+<b>heading</b>
+-this one is a heading
+-----
+
+<b>heading</b> - this is a heading too
+-----