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wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-search/compatibility/jetpack.php

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+<?php
+/**
+ * Jetpack compatibility
+ *
+ * @package automattic/jetpack-search
+ */
+
+namespace Automattic\Jetpack\Search\Compatibility\Jetpack;
+
+use Jetpack;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+/**
+ * Override the condition to show Search submenu when Jetpack plugin exists.
+ */
+function should_show_jetpack_search_submenu() {
+	if ( ! current_user_can( 'manage_options' ) ) {
+		return false;
+	}
+
+	// If site is in Offline Mode or not connected yet.
+	if ( ! Jetpack::is_active_and_not_offline_mode() ) {
+		return false;
+	}
+
+	return true;
+}
+
+add_filter( 'jetpack_search_should_add_search_submenu', __NAMESPACE__ . '\should_show_jetpack_search_submenu' );

wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-search/compatibility/search-0.15.2.php

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+<?php // phpcs:ignore WordPress.Files.FileName.NotHyphenatedLowercase
+/**
+ * Compatibility for Jetpack Search version <= 0.15.2.
+ *
+ * @package automattic/jetpack-search
+ */
+
+namespace Automattic\Jetpack\Search\Compatibility\Jetpack;
+
+use Automattic\Jetpack\Search\Instant_Search;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+add_filter( 'option_sidebars_widgets', __NAMESPACE__ . '\convert_old_jetpack_search_sidebar', 10, 2 );
+
+/**
+ * Map the old Jetpack Search sidebar to the new Instant Search sidebar.
+ *
+ * @param array $sidebars_widgets Value of `sidebars_widgets` option.
+ */
+function convert_old_jetpack_search_sidebar( $sidebars_widgets ) {
+	if ( ! empty( $sidebars_widgets[ Instant_Search::INSTANT_SEARCH_SIDEBAR ] ) || empty( $sidebars_widgets[ Instant_Search::OLD_INSTANT_SEARCH_SIDEBAR ] ) ) {
+		return $sidebars_widgets;
+	}
+	$sidebars_widgets[ Instant_Search::INSTANT_SEARCH_SIDEBAR ] = $sidebars_widgets[ Instant_Search::OLD_INSTANT_SEARCH_SIDEBAR ];
+	unset( $sidebars_widgets[ Instant_Search::OLD_INSTANT_SEARCH_SIDEBAR ] );
+	return $sidebars_widgets;
+}

wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-search/compatibility/search-0.17.0.php

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+<?php // phpcs:ignore WordPress.Files.FileName.NotHyphenatedLowercase
+/**
+ * Compatibility for Jetpack Search version <= 0.17.0.
+ *
+ * @package automattic/jetpack-search
+ */
+
+namespace Automattic\Jetpack\Search\Compatibility\Jetpack;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+add_filter( 'option_jetpack_search_overlay_trigger', __NAMESPACE__ . '\map_results_overlay_trigger', 10, 2 );
+
+/**
+ * We've retired the 'results' overlay trigger and want to migrate users to the similar 'immediate' setting.
+ *
+ * @param string $overlay_trigger Overlay trigger.
+ */
+function map_results_overlay_trigger( $overlay_trigger ) {
+	return 'results' === $overlay_trigger ? \Automattic\Jetpack\Search\Options::OVERLAY_TRIGGER_IMMEDIATE : $overlay_trigger;
+}

wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-search/compatibility/unsupported-browsers.php

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+<?php // phpcs:ignore WordPress.Files.FileName.NotHyphenatedLowercase
+/**
+ * Compatibility for browsers that don't support Instant Search.
+ *
+ * @package automattic/jetpack-search
+ */
+namespace Automattic\Jetpack\Search\Compatibility;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+add_filter( 'jetpack_search_classic_search_enabled', __NAMESPACE__ . '\enable_classic_search_for_unsupported_browsers', 10, 1 );
+
+/**
+ * Get the iOS version from the user agent.
+ *
+ * @param string $user_agent The user agent string.
+ * @return null|string The iOS version, or null if not found.
+ */
+function get_ios_version_from_user_agent( $user_agent ) {
+	preg_match( '#\((iPhone|iPad|iPod).*?OS (\d+_?\d?_?\d?).*?\)#', $user_agent, $matches );
+
+	if ( empty( $matches[2] ) ) {
+		return null;
+	}
+
+	$version = str_replace( '_', '.', $matches[2] );
+	return $version;
+}
+
+/**
+ * Force enable Classic Search for browsers for iOS versions < 16.
+ *
+ * @param boolean $classic_search_enabled whether Classic Search is enabled.
+ */
+function enable_classic_search_for_unsupported_browsers( $classic_search_enabled ) {
+	$ios_version = get_ios_version_from_user_agent( isset( $_SERVER['HTTP_USER_AGENT'] ) ? filter_var( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ) : '' );
+	if ( $ios_version && version_compare( $ios_version, '16.0', '<' ) ) {
+		return true;
+	}
+	return $classic_search_enabled;
+}