Adds the ‘Theme File Editor’ menu item to the bottom of the Appearance (non-block themes) or Tools (block themes) menu.

Source

function _add_themes_utility_last() {
	add_submenu_page(
		wp_is_block_theme() ? 'tools.php' : 'themes.php',
		__( 'Theme File Editor' ),
		__( 'Theme File Editor' ),
		'edit_themes',
		'theme-editor.php'
	);
}

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