#3601415 Expose displayOn on a dedicated WebformElementDisplayOnBase interface (!96) · Merge requests · project / graphql_webform

Split the conflated WebformElementMarkupBase interface, which carried both markup (rendered HTML) and displayOn (where an element is shown).

Add WebformElementDisplayOnBase carrying displayOn, implemented by every element whose plugin implements WebformElementDisplayOnInterface (messages, labels, more disclosures, views, horizontal rules, variants and computed).
Narrow WebformElementMarkupBase to markup, implemented only by the elements that render authored HTML (webform_markup, processed_text). The display-only elements no longer expose an always-null markup field.
Resolve displayOn's default per element from the element plugin's display_on default, since the built render array omits #display_on unless configured and the default is element-specific. This removes the parallel computedDisplayOn resolver field and drops displayOn from WebformElementComputedBase.

#3601415 Expose displayOn on a dedicated WebformElementDisplayOnBase interface