fix: fix tabs at beginning of list items (#2679)

* fix: fix tabs at beginning of list items

* test: add test for ordered list

src/Tokenizer.js

@@ -203,7 +203,7 @@ export class Tokenizer {
         raw = cap[0];
         src = src.substring(raw.length);
 
-        line = cap[2].split('\n', 1)[0];
+        line = cap[2].split('\n', 1)[0].replace(/^\t+/, (t) => ' '.repeat(3 * t.length));
         nextLine = src.split('\n', 1)[0];
 
         if (this.options.pedantic) {
@@ -225,7 +225,7 @@ export class Tokenizer {
         }
 
         if (!endEarly) {
-          const nextBulletRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}(?:[*+-]|\\d{1,9}[.)])((?: [^\\n]*)?(?:\\n|$))`);
+          const nextBulletRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}(?:[*+-]|\\d{1,9}[.)])((?:[ \t][^\\n]*)?(?:\\n|$))`);
           const hrRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}((?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$)`);
           const fencesBeginRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}(?:\`\`\`|~~~)`);
           const headingBeginRegex = new RegExp(`^ {0,${Math.min(3, indent - 1)}}#`);

test/specs/new/list_item_tabs.html

@@ -0,0 +1,17 @@
+<ul>
+  <li>A</li>
+  <li>B</li>
+  <li>C</li>
+  <li>D</li>
+  <li>E</li>
+  <li>F</li>
+</ul>
+
+<ol>
+  <li>A</li>
+  <li>B</li>
+  <li>C</li>
+  <li>D</li>
+  <li>E</li>
+  <li>F</li>
+</ol>

test/specs/new/list_item_tabs.md

@@ -0,0 +1,13 @@
+- A
+-   B
+-	C
+-	D
+-	E
+-	F
+
+1. A
+2.   B
+3.	C
+4.	D
+5.	E
+6.	F