Ticket #45928: 45928.patch

src/wp-content/themes/twentynineteen/inc/color-patterns.php

@@ -12 +12 @@
  */
 function twentynineteen_custom_colors_css() {
 
-        $primary_color = 199;
+        $primary_color = apply_filters( 'twentynineteen_custom_colors_primary_color', 199 );
         if ( 'default' !== get_theme_mod( 'primary_color', 'default' ) ) {
                 $primary_color = absint( get_theme_mod( 'primary_color_hue', 199 ) );
         }