Compatibility between SDC and the Form API

Changes are made on on 11.x (our main development branch) first, and are then back ported as needed according to the Core change policies → .

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Hello,

@ghost of drupal past, thanks for the proposal.

First POC, trying to tell Element::children to got looking into #slots if the element is a component make the form element inside the component to be prepared by the Form API, but:

1. It remains duplicated on rendering (one textfield outside the component, one inside)
2. The 2 elements have the same name attribute, so when submitting the form it is the element in the component which value is retrieved but I think it i only a side effect of having duplicated name.
3. "parent" mechanism in the form API may be confused/malformed.

So next step will be to try to put slots as component element child and so adapt SDC (and later table element too).

But previous results makes this approach very side effect prone.

Yes, that sounds risky, but it worth to check.