Issue:

Install web_widget_text_markdown.
Open any sale order with sale order lines, it will throw js traceback. Issue is with tax_id field inside sale order lines.

An array is passed to the Markdown Lexer instead of string.

Reproduce:
The issue can be reproduced on our runbot with this link.

Demo:
I have uploaded demo video explaining/debugging the bug.

Introduced in this commit

Thank you.