Ticket #43969: 43969.patch

src/wp-includes/class-wp-editor.php

@@ -1411 +1411 @@
                 $version = 'ver=' . $tinymce_version;
                 $baseurl = self::get_baseurl();
 
+                $has_custom_theme = false;
+                foreach ( self::$mce_settings as $init ) {
+                        if ( ! empty( $init['theme_url'] ) ) {
+                                $has_custom_theme = true;
+                                break;
+                        }
+                }
+
                 $compressed = $compress_scripts && $concatenate_scripts && isset( $_SERVER['HTTP_ACCEPT_ENCODING'] )
-                        && false !== stripos( $_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip' );
+                        && false !== stripos( $_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip' ) && ! $has_custom_theme;
 
                 // Load tinymce.js when running from /src, else load wp-tinymce.js.gz (production) or tinymce.min.js (SCRIPT_DEBUG)
                 $mce_suffix = false !== strpos( get_bloginfo( 'version' ), '-src' ) ? '' : '.min';