Preserve filters when searching on events page

[dd32]

Summary

• The search block on the events page submitted to the default WordPress search results URL, losing any active filters and leaving the events page
• Fixes this by using the render_block_core/search filter to:
  1. Change the search form action URL to stay on the events page (using the existing build_form_action_url() helper)
  2. Inject active filter values (event_type, format_type, month, country) as hidden inputs into the search form

How it works

• The render_block_core/search filter modifies the core search block HTML output
• Active filter query vars are read and added as hidden <input> elements inside the <form>
• The form action attribute is replaced with the events page URL
• When the user searches, the request includes both the search term and any active filters

Screenshots

Before — filter bar on events page:

After — filters preserved when searching:

Test plan

• Go to the events page and apply a filter (e.g. Format: Online)
• Enter a search term and submit
• Verify the search results still show on the events page (not the WordPress search results page)
• Verify the filter is still active after searching
• Search without any filters active — verify it still works and stays on the events page
• On the home page with filters, search and verify filters are preserved

Fixes WordPress#1167

🤖 Generated with Claude Code

[dd32]

Those screenshots are of the wrong thing..

[dd32]

Filed upstream: WordPress#1674