fix(markdown): do not collapse multiple newlines

packages/markdown-parser/src/index.ts

@@ -385,7 +385,7 @@ function parse(
                     result += '\n'
                 }
 
-                const nonWhitespace = text.slice(pos + 1).search(/\S/)
+                const nonWhitespace = text.slice(pos + 1).search(/[^ \t]/)
 
                 if (nonWhitespace !== -1) {
                     pos += nonWhitespace + 1

packages/markdown-parser/src/markdown-parser.test.ts

@@ -533,6 +533,12 @@ describe('MarkdownMessageEntityParser', () => {
                 [createEntity('messageEntityBold', 10, 4)],
                 'some text\nbold\nmore text',
             )
+
+            test(
+                md_`text\n\n\nmore text`,
+                [],
+                'text\n\n\nmore text',
+            )
         })
 
         it('should process entities', () => {