Ticket #39281: 39281.diff

src/wp-content/themes/twentyseventeen/functions.php

@@ -502 +502 @@
 add_filter( 'frontpage_template',  'twentyseventeen_front_page_template' );
 
 /**
+ * Whether the featured image should be shown.
+ *
+ * @since Twenty Seventeen 1.1
+ *
+ * @return bool Whether the post thumbnail should be shown.
+ */
+function twentyseventeen_should_show_featured_image() {
+        $show = has_post_thumbnail() && ( is_single() || ( is_page() && ! twentyseventeen_is_frontpage() ) );
+
+        /**
+         * Filter whether the featured image should be shown.
+         *
+         * @param bool $show Whether to show the featured image.
+         */
+        return apply_filters( 'twentyseventeen_should_show_featured_image', $show );
+}
+
+/**
  * Implement the Custom Header feature.
  */
 require get_parent_theme_file_path( '/inc/custom-header.php' );

src/wp-content/themes/twentyseventeen/header.php

@@ -42 +42 @@
 
         <?php
         // If a regular post or page, and not the front page, show the featured image.
-        if ( has_post_thumbnail() && ( is_single() || ( is_page() && ! twentyseventeen_is_frontpage() ) ) ) :
+        if ( twentyseventeen_should_show_featured_image() ) :
                 echo '<div class="single-featured-image-header">';
                 the_post_thumbnail( 'twentyseventeen-featured-image' );
                 echo '</div><!-- .single-featured-image-header -->';