Add Markdown syntax support to Text, TextInput, TextEdit.

[MINGtoMING]

I'm using slint(rust) to develop a blog interface that needs to support Markdown syntax rendering to enhance presentation. Thanks.

[ogoffart]

Thanks for the feature request.
The ability to have rich text backed by HTML or Markdown is already tracked in #2723
I'm going to close this issue as a duplicate. But thanks anyway for the request.