Make sure inner blocks are sent to the frontend even if the Save/View component doesn't render them initially

[DAreRodz]

Right now, when inner blocks are hidden in the editor, they are not serialized and stored in the WP database, so that information is lost. Thus, the block cannot interactively show inner blocks later in the browser.

There were some previous attempts to solve this by adding a <template> tag.

• Support initially hidden inner blocks #8

However, we removed the <template> tag on #28 (see fc6fa92).

Related to #29.

[luisherranz]

Should we try to do this in the Gutenberg repo instead? Maybe in the serializer?

I'm not sure if it makes sense to do it in user land when it won't be necessary, and here we have already tested that the <template> approach works fine.

[luisherranz]

For anyone interested in taking a look at this, I think that what needs to happen is:

Excalidraw

Non-interactive blocks don't need this because those "hidden" inner blocks won't ever be shown, and therefore they don't need to be sent to the client.

[luisherranz]

Closed as we're not actively working on this experiment anymore and this works fine in the Directives Hydration.