Ticket #27406: 27406.disallow-single-section-panels.diff

src/wp-includes/class-wp-customize-manager.php

@@ -887 +887 @@
                                 continue;
                         }
 
+                        // If there is only one section in the panel, don't display the panel.
+                        // Display the section in the top level instead, and re-sort.
+                        if ( 1 === count( $panel->sections ) ) {
+                                $section = $panel->sections[0];
+                                // Add the panel title to the section title for context.
+                                $title = $panel->title . _x( ': ', 'Customizer panel-title: section-title separator when panel is displayed as the single section that it contains.' ) . $section->title;
+                                $section->title = $title;
+                                $this->sections[] = $section;
+                                usort( $this->sections, array( $this, '_cmp_priority' ) );
+                                continue;
+                        }
+
                         usort( $panel->sections, array( $this, '_cmp_priority' ) );
                         $panels[] = $panel;
                 }