Links clicked from previews inside of MarkdownEditor open in both working and new tab

[marywhite]

Description

When using the a preview is rendered inside of the MarkdownEditor component, the MarkdownViewer component is rendered with a supplied openLinksInNewTab prop.

Because the default link behavior is not prevented, clicking these links has the consequence of opening the link inside of the current tab and new tab.

Video of clicking the preview button with renderPreview hardcoded to return a link:

link-navigation-before.mov

Steps to reproduce

1. Go to https://primer.style/react/drafts/MarkdownViewer
2. Add openLinksInNewTab to example code
3. Click on link in preview
4. Observe that browser navigation has occurred in new and current tab

Version

v35.16.0

Browser

Chrome