[FR] Hope to enhance the functionality of the PDF table of contents

[DanShui-Yu]

Personal expectations for enhancements include the following points:

1. The left sidebar can be set to default to the "Table of Contents" view.
2. The table of contents can expand in a floating state with adjustable transparency.
3. The table of contents can have a separate keyword search function.

[RyotaUshio]

1. I will add a new option for this purpose in the next release.
2. It's probably not easy because of how the core pdf.js library implements the sidebar. But I'm open to pull requests!
3. Sounds nice and useful, and I guess it's possible, so I'll give it a try when I get a chance (but not in the short term; again, I will welcome PRs).

[RyotaUshio]

1 is now available in 0.39.25.