Add Cmd+V/Ctrl+V paste support for URLs turning them into Markdown links

[vittorius]

(I haven't found any existing issues, open or closed, on this topic.)

It would be great to handle the Cmd+V/Ctrl+V on a selected text to auto-create a Markdown hyperlink when inserting a URL, just like the Github web UI does.

[alexr00]

Is this in the PR description or in the comments widget in the editor?

[vittorius]

In the comments widget when commenting a file

[alexr00]

@mjbvz I think you've done work recently to improve the pasting behavior for links in editors where the language is markdown. Do you know if there's a way I can include your markdown pasting work in the comment editor?

[mjbvz]

Possible but may be some work. What needs to happen:

1. Expose the comment input editor document as a text document that extensions can see. Not sure if this is already done, but you can checkout scm input as an example
2. Add CopyPasteController as a contribution in that editor
3. Make sure that the markdown extension features work. Probably should but the paste features may need to be registered for scminput too

[alexr00]

To verify:

• Install an extension that provides commenting, such as GitHub Pull Requests.
• Add a comment. In the comment widget editor, past in a url.
• Verify that it pastes as a markdown comment.

[benibenj]

Verified assuming that it's not meant to do it automatically, but by using the paste options.