Search block: double-encodes apostrophes in the input value

[Mayank-Tripathi32]

closes #76010

What?

Fixes the double-encoding of special characters (e.g., apostrophes) in the Search block's input field on the search results page.

Why?

When searching for a term containing an apostrophe (e.g., "ada's"), the search input field on the results page displays ada's instead of ada's. This happens because get_search_query() returns a pre-escaped string (via esc_attr()), and WP_HTML_Tag_Processor::set_attribute() escapes it again, causing double-encoding.

How?

Pass false to get_search_query() in index.php so it returns the raw, unescaped query string. WP_HTML_Tag_Processor::set_attribute() already handles attribute escaping internally, so the single round of escaping is sufficient and correct.

- $input->set_attribute( 'value', get_search_query() );
+ $input->set_attribute( 'value', get_search_query( false ) );

Testing Instructions

1. Add a Search block to any page or template.
2. On the frontend, search for a term containing an apostrophe, e.g., ada's.
3. On the search results page, verify the search input field displays ada's correctly (not ada's).
4. Also test with other special characters like "quotes", , and &ampersand to confirm they render correctly without double-encoding.

Testing Instructions for Keyboard

1. Use Tab to navigate to the search input field.
2. Type a search term containing an apostrophe and press Enter.
3. On the results page, Tab back to the search input and verify the displayed value is correct.

Screencast

Search.v2.mov

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Co-authored-by: Mayank-Tripathi32 <mayanktripathi32@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>
Co-authored-by: katag9k <katag9k@git.wordpress.org>

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[Mamaduka]

Thanks, @Mayank-Tripathi32!