fix(markdown): do not break before special prefix (#3347)

src/printer-markdown.js

@@ -100,7 +100,7 @@ function genericPrint(path, options, print) {
       const nextNode = parentNode.children[index + 1];
 
       // leading char that may cause different syntax
-      if (nextNode && /^>|^([-+*]|#{1,6})$/.test(nextNode.value)) {
+      if (nextNode && /^>|^([-+*]|#{1,6}|[0-9]+[.)])$/.test(nextNode.value)) {
         return node.value === "" ? "" : " ";
       }
 

tests/markdown_paragraph/__snapshots__/jsfmt.spec.js.snap

@@ -116,6 +116,8 @@ abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc
   - disallow identical titles.
 * [valid-expect](/packages/eslint-plugin-jest/docs/rules/valid-expect.md) -
   ensure expect is called correctly.
+
+She grew up in an isolated village in the 19th century and met her father aged 29. Oh no, why are we in a numbered list now?
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc
 abc - abc abc abc
@@ -142,6 +144,9 @@ abc - abc abc abc
 * [valid-expect](/packages/eslint-plugin-jest/docs/rules/valid-expect.md) -
   ensure expect is called correctly.
 
+She grew up in an isolated village in the 19th century and met her father
+aged 29. Oh no, why are we in a numbered list now?
+
 `;
 
 exports[`special-prefix.md 2`] = `
@@ -164,6 +169,8 @@ abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc
   - disallow identical titles.
 * [valid-expect](/packages/eslint-plugin-jest/docs/rules/valid-expect.md) -
   ensure expect is called correctly.
+
+She grew up in an isolated village in the 19th century and met her father aged 29. Oh no, why are we in a numbered list now?
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc - abc abc abc
 
@@ -184,6 +191,8 @@ abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc
   * disallow identical titles.
 * [valid-expect](/packages/eslint-plugin-jest/docs/rules/valid-expect.md) - ensure expect is called correctly.
 
+She grew up in an isolated village in the 19th century and met her father aged 29. Oh no, why are we in a numbered list now?
+
 `;
 
 exports[`whitespace.md 1`] = `

tests/markdown_paragraph/special-prefix.md

@@ -17,3 +17,5 @@ abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc abc
   - disallow identical titles.
 * [valid-expect](/packages/eslint-plugin-jest/docs/rules/valid-expect.md) -
   ensure expect is called correctly.
+
+She grew up in an isolated village in the 19th century and met her father aged 29. Oh no, why are we in a numbered list now?