Support local paths in hover MarkdownString

Currently paths to images / links used in hover docs must be absolute, otherwise they will not work. Consider a file main.ts:

/**
 * [link](main.ts)
 */
function main() {
}

If you hover over main and click the link, it will attempt to open /main.ts file, which does not exist. I think it would be sensible if the behavior was exactly the same as with markdown preview. Example of file main.md:

[link](main.ts)

Here, clicking the link would properly open the main.ts file, assuming that it’s in the same directory.

Here is a project with these two files: project.zip

[mjbvz]

@DanTup See #142051

[vscodebot[bot]]

🙂 This feature request received a sufficient number of community upvotes and we moved it to our backlog. To learn more about how we handle feature requests, please see our documentation.

Happy Coding!