Embedding HTML in diagnostic message

[wongjiahau]

At the moment, VSCode Diagnostic API only supports plain text error message.

But sometimes, I find that it might be useful if I can decorate some words in the error message, for example making the word bold or italics, especially when we want to describe certain identifiers are problematic. The common approach is to enclosed them with backtick.

To achieve this, we just need to allow user to embed HTML within the error message and let the error message UI to render the HTML.

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Allow diagnostics messages to have markdown (or formatted text) content (#54272)

[wongjiahau]

Duplicates of #54272