Test the markdown preview custom editor

[mjbvz]

Test for #84520

• Any @sandy081
• Any @rchiodo

Complexity: 5

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This is an exploratory test plan item for the markdown preview custom editor. This allows you to use reopen with to reopen the current document as a markdown preview instead of as a normal text editor .

For this test plan item, please try using the new preview editor and seeing what doesn't work as expected. Some specific things to try:

• Try using reopen with to switch a text document to a markdown preview

• Try configuring workbench.editorAssociations to use the preview by default:

  "workbench.editorAssociations": {
    "*.md": "vscode.markdown.preview.editor"
  }
  

• Make sure clicking on links works as expected using the new markdown preview.

  Try using the vscode-docs repo since it has lots of links between files (images will not load since they use git LFS)

• Make sure scroll positions are restored properly when reloading a window or switching away from an editor and back

• Make sure scroll sync is disabled for preview based custom editors

[sandy081]

Make sure scroll sync is disabled for preview based custom editors

Do you mean between preview & custom editor?

[rchiodo]

Make sure scroll sync is disabled for preview based custom editors

This seems to be sync'd so I'm also not sure what this means. Do you mean between 'Open Preview' and the editor we're testing?

The scroll position is sync'd as long as the two editors aren't visible at the same time.