Posts list table: Add a filter to disable the months dropdown.

It was previously possible to prevent it from displaying by filtering everything out from the results, but if one really doesn't want it, they should be able to short-circuit before the query even runs.

props norcross, SergeyBiryukov.
fixes #30254.

Built from https://develop.svn.wordpress.org/trunk@31438


git-svn-id: http://core.svn.wordpress.org/trunk@31419 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-list-table.php

@@ -509,6 +509,18 @@ class WP_List_Table {
 	protected function months_dropdown( $post_type ) {
 		global $wpdb, $wp_locale;
 
+		/**
+		 * Filter whether to remove the 'Months' drop-down from the post list table.
+		 *
+		 * @since 4.2.0
+		 *
+		 * @param bool   $disable   Whether to disable the drop-down. Default false.
+		 * @param string $post_type The post type.
+		 */
+		if ( apply_filters( 'disable_months_dropdown', false, $post_type ) ) {
+			return;
+		}
+
 		$months = $wpdb->get_results( $wpdb->prepare( "
 			SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month
 			FROM $wpdb->posts

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31432';
+$wp_version = '4.2-alpha-31438';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.