WordPress at a glance
filter is not described

the_editor filter-hook . WP 2.1.0

Filters the HTML markup output that displays the editor.

Usage

add_filter( 'the_editor', 'filter_function_name_4386' );
function filter_function_name_4386( $output ){
	// filter...

	return $output;
}
$output(string)
Editor's HTML markup.

Where the hook is called

_WP_Editors::editor()
wp-includes/class-wp-editor.php 254-257
$the_editor = apply_filters( 'the_editor', '<div id="wp-' . $editor_id_attr . '-editor-container" class="wp-editor-container">' .
	$quicktags_toolbar .
	'<textarea' . $editor_class . $height . $tabindex . $autocomplete . ' cols="40" name="' . esc_attr( $set['textarea_name'] ) . '" ' .
	'id="' . $editor_id_attr . '">%s</textarea></div>' );

Where the hook is used (in WP core)

Does not used.