Go to definition is showing up when I ctrl+click a link in a markdown file

[Tyriar]

The content of the line:

- Improvements to help debug local link detector unit tests https://github.com/microsoft/vscode/pull/169573

Open definition does nothing

[stevebrownlee]

Also happens on Mac with Cmd+Click. Makes it very difficult to navigate my documentation.

[mjbvz]

@jrieken I believe this is a result of fixing #147447

Markdown has a link provider and a definition provider. However in this case, the definition provider returns undefined since we are not on a reference link

[jrieken]

revert of the bad change is up