Introduce WP_List_Table::get_column_count() and take care of update notice <tr>. Props ocean90 for initial patch. Fixes #15318

git-svn-id: https://develop.svn.wordpress.org/trunk@16368 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/js/common.dev.js

@@ -147,10 +147,12 @@ columns = {
 
 	checked : function(column) {
 		$('.column-' + column).show();
+		this.colSpanChange(+1);
 	},
 
 	unchecked : function(column) {
 		$('.column-' + column).hide();
+		this.colSpanChange(-1);
 	},
 
 	hidden : function() {
@@ -164,6 +166,14 @@ columns = {
 				return id.substring( id, id.length - 5 );
 			}).get().join(',');
 		};
+	},
+
+	colSpanChange : function(diff) {
+		var $t = $('table').find('.colspanchange');
+		if ( !$t.length )
+			return;
+		var n = parseInt( $t.attr('colspan'), 10 ) + diff;
+		$t.attr('colspan', n.toString());
 	}
 }