Block Theme Previews: add option to switch between different themes to preview

[annezazu]

This was raised by @carolinan as part of the FSE Outreach Program's Rapid Revamp call for testing:

Once I clicked on the Live Preview link and entered the Site Editor with the Navigation Sidebar (the dark grey menu area) on the left, I was expecting to be able to navigate between all the installed block themes and WordPress.org block themes, similar to how the preview of classic themes work.

Here's the experience with classic themes to imagine for block themes in the Site Editor previewing mechanism:

classic.theme.preview.mov

I remember seeing some designs floating around that considered this. cc @WordPress/gutenberg-design just in case!

[annezazu]

Huzzah, found the design showing access to block themes from the Design section.

Worth reusing here :)

[jasmussen]

I think @jameskoster has a separate issue for the "meta links" in the save hub, and has a newer design for themes access.

[jameskoster]

and has a newer design for themes access

This one:

Perhaps there's a way for that element to accommodate inline theme switching, rather than sending folks off to the legacy themes grid in wp-admin?

The theme switch can be expressed in the save modal:

The trade-off with this approach is that it would only be able to handle block themes.

[richtabor]

Perhaps there's a way for that element to accommodate inline theme switching, rather than sending folks off to the legacy themes grid in wp-admin?

I don't think it's particularly useful without visuals representing the themes (like classic has). Seems a bit too forward-facing too to have theme switching accessible from the main SE navigation. I think a "Browse themes" link would work fine until a future where there is theme switching (including partial theme switching) in the SE.

[scruffian]

It's technically very easy to do: #50388

[jameskoster]

I think a "Browse themes" link would work fine until a future where there is theme switching (including partial theme switching) in the SE.

I agree this would be a satisfactory bare minimum.

But it would be nice to have quick switching while previewing a theme. It's currently a very tedious process (see the video in Ben's PR).