47369.2.diff on Ticket #47369 – Attachment – WordPress Trac

src/wp-admin/admin-header.php

diff --git src/wp-admin/admin-header.php src/wp-admin/admin-header.php
index c6760f9b86..7fbbb66623 100644

  var ajaxurl = '<?php echo admin_url( 'admin-ajax.php', 'relative' ); ?>',
         decimalPoint = '<?php echo addslashes( $wp_locale->number_format['decimal_point'] ); ?>',
         isRtl = <?php echo (int) is_rtl(); ?>;
 </script>
-<meta name="viewport" content="width=device-width,initial-scale=1.0">
 <?php
 /**

diff --git src/wp-admin/customize.php src/wp-admin/customize.php
index a8b62f4195..2d7d3ae84e 100644

  $body_class = 'wp-core-ui wp-customizer js';
 if ( wp_is_mobile() ) :
         $body_class .= ' mobile';
+        ?>
+        <meta name="viewport" id="viewport-meta" content="width=device-width, initial-scale=1.0, minimum-scale=0.5, maximum-scale=1.2" />
+        <?php
+        add_filter( 'admin_viewport_meta', '_customizer_mobile_viewport_meta' );
 endif;
 if ( $wp_customize->is_ios() ) {
-…
+ do_action( 'customize_controls_print_styles' );
  * @since 3.4.0
  */
 do_action( 'customize_controls_print_scripts' );
+/**
+ * Fires when Customizer control scripts are printed.
+ *
+ * @since 5.3.0
+ */
+do_action( 'customize_controls_head' );
 ?>
 </head>
 <body class="<?php echo esc_attr( $body_class ); ?>">

diff --git src/wp-admin/includes/admin-filters.php src/wp-admin/includes/admin-filters.php
index 4e66b28bb8..e4d51aa3e1 100644

  add_action( 'login_init', 'wp_admin_headers' );
 add_action( 'admin_head', 'wp_admin_canonical_url' );
 add_action( 'admin_head', 'wp_color_scheme_settings' );
 add_action( 'admin_head', 'wp_site_icon' );
+add_action( 'admin_head', '_ipad_meta' );
+add_action( 'admin_head', 'wp_admin_viewport_meta' );
+add_action( 'customize_controls_head', 'wp_admin_viewport_meta' );
 // Prerendering.
 if ( ! is_customize_preview() ) {

diff --git src/wp-admin/includes/misc.php src/wp-admin/includes/misc.php
index 736dba8f3e..b584024114 100644

  function wp_color_scheme_settings() {
+}
 /**
+ * @since 3.3.0
+ * Displays the viewport meta in the admin
+ *
+ * @since 5.3.0
  */
+function _ipad_meta() {
+        if ( wp_is_mobile() ) {
+                ?>
+                <meta name="viewport" id="viewport-meta" content="width=device-width, initial-scale=1">
+                <?php
+function wp_admin_viewport_meta() {
+        /**
+         * Filters the viewport meta in the admin.
+         *
+         * @since 5.3.0
+         *
+         * @param string $viewport_meta The viewport meta.
+         */
+        $viewport_meta = apply_filters( 'admin_viewport_meta', 'width=device-width,initial-scale=1.0' );
+        if ( empty( $viewport_meta ) ) {
+                return;
+        }
+        echo '<meta name="viewport" content="' . esc_attr( $viewport_meta ) . '">';
+}
+/**
+ * Viewport meta for mobile in customize.
+ *
+ * Hooked to the {@see 'admin_viewport_meta'} filter
+ *
+ * @since 5.3.0
+ */
+function _customizer_mobile_viewport_meta( $content ) {
+        return trim( $content, ',' ) . ',minimum-scale=0.5,maximum-scale=1.2';
+}
 /**