is_customize_preview()
Function: Whether the site is being previewed in the Customizer.
Source: wp-includes/theme.php:3709
_wp_keep_alive_customize_changeset_dependent_auto_drafts()
Function: Makes sure that auto-draft posts get their post_date bumped or status changed to draft to prevent premature garbage-collection.
Source: wp-includes/theme.php:3744
_delete_attachment_theme_mod()
Function: Checks an attachment being deleted to see if it’s a header or background image.
Source: wp-includes/theme.php:3332
check_theme_switched()
Function: Checks if a theme has been changed and runs ‘after_switch_theme’ hook on the next WP load.
Source: wp-includes/theme.php:3360
after_switch_theme
Action Hook: Fires on the first WP load after a theme switch if the old theme still exists.
Source: wp-includes/theme.php:3387
_wp_customize_include()
Function: Includes and instantiates the WP_Customize_Manager class.
Source: wp-includes/theme.php:3412
_wp_customize_publish_changeset()
Function: Publishes a snapshot’s changes.
Source: wp-includes/theme.php:3520
_wp_customize_changeset_filter_insert_post_data()
Function: Filters changeset post data upon insert to ensure post_name is intact.
Source: wp-includes/theme.php:3595
_wp_customize_loader_settings()
Function: Adds settings for the customize-loader script.
Source: wp-includes/theme.php:3611
_custom_header_background_just_in_time()
Function: Registers the internal custom header and background routines.
Source: wp-includes/theme.php:2842