The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: Infinite-Null <ankitkumarshah@git.wordpress.org>
Co-authored-by: bacoords <bacoords@git.wordpress.org>
Co-authored-by: richtabor <richtabor@git.wordpress.org>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

Thanks for a PR for my issue. I can't speak to the code approach, but I can speak to the user experience of testing this PR:

1. Overall does what it says. For some reason the right hand sidebar can remember which tab you're on (Post vs Block) but the left hand sidebar does not (Block vs Pattern, or List vs Outline). It returns the correct left sidebar, but always selects the first tab. But not sure that's a blocker.
2. The animation is a bit glitchy because the sidebar suddenly positions to the top over the "W" logo. This might be a CSS fix - you could see how the right sidebar handles it.