WordPress
Allow third party to feature its own blocks in the link control panel
What problem does this address?
For the moment, the list of available blocks in the transform section of the link control panel is hardcoded here. It's not possible for a third party plugin to feature a custom block for navigation.
There is still a workaround by adding a random link and transforming it into another kind of block. But from a user point of view it is not convenient at all.
Some context and practical example
Let's take a concrete case with Polylang Pro which provides a language switcher for the navigation block. Unfortunately users can't add it without performing a transform operation on a link block
See bellow what's currently displayed in the transform control panel:
There is no way to easily transform a link into a block other than core/site-logo, core/social-links or core/search.
Instead it would be great to feature our language switcher block like this:
Users will now be able to easily add our block.
Proposed solution
It would be great to open this block list, with a new filter for instance. With such a filter we could easily add blocks.
Maybe linked to this issue https://github.com/WordPress/gutenberg/issues/33278
Wouldn't it be better if the language switcher could be directly (somehow) inserted in the menu, instead of inserting a link first and transforming later?
