Markdown goes wrong when interprets some CJK characters

[LittleYe233]

I have found that some formats (like bold, italic, deleting line) can't be shown well when these special characters are between certain CJK characters.

I have tested in some situations and the testing results are as below.

Code	Preview in Code	Result	Notes
~~aaa~~	aaa	OK	All letters
~~（~~	（	OK	Chinese bracket
aa~~（~~	aa（	Failed	Chinese bracket and letter
aa~~aa~~	aaaa	OK	Both letters
符号~~aa~~	符号aa	OK	Chinese characters and letters
符号~~符号~~	符号\~\~符号\~\~	Failed	All Chinese characters. And it can be shown by Github Markdown but failed in VSCode Markdown.

Other grammers have the similar errors too. Test results about them are omitted.

I use strapdown.js to interpret the markdown codes above and they are shown well. So I think the Markdown interpreter in VSCode may have some bugs.

• VSCode Version: 1.44.0 (user setup)
• OS Version: Windows_NT x64 6.1.7601

Steps to Reproduce:

1. Create a new Markdown file.
2. Write the codes.
3. Click the 'preview' button and check the results.

Does this issue occur when all extensions are disabled?: Yes

[mjbvz]

The markdown preview uses markdown-it for rendering and I believe I see the same behavior in the markdown-it demo

Please file this issue upstream against markdown-it since we cannot fix this on the VS Code side

[LittleYe233]

@mjbvz I found the same issue on 'markdown-it'. Thanks for your answer!