adjustLinkSelection does not select whole link

[jdhuntington]

Describe the bug
When editing an existing link using adjustLinkSelection where the link has multiple words (eg <a href="#">foo bar baz</a>), only a single word will be returned when the cursor is on bar and no selection exists.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://microsoft.github.io/roosterjs/index.html
2. Type "this is a test foo bar baz"
3. Highlight "foo bar baz"
4. Click the ribbon icon to insert a link
5. Keep "foo bar baz" as "Display as", pick anything for the URL (eg #)
6. Click "ok"
7. Clear the selection
8. Put the cursor in the middle of "baz" (which is now part of a link)
9. Click "Insert link" again
10. Notice "Display as" contains only "baz"

Expected behavior
In the final step, "Display as" should contain "foo bar baz"

Screenshots

Device Information
macOS, firefox (evergreen)

[JiuqingSong]

Thanks, I can repro.