id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
15507	Update multipolygon action no longer works (since JOSM 12914)	sebastic	team	"Since JOSM 12914 the 'Update multipolygon' action no longer works.

Selecting the (only) outer way and the relation, and then using Ctrl+Shift+B or the menu option does not perform any action (nothing logged in debug mode on the console either).

The 'Create multipolygon' action still works.

SVN r12726 looks like a possible culprit where this change was committed to `src/org/openstreetmap/josm/actions/CreateMultipolygonAction.java`:
{{{
#!diff
@@ -247,7 +247,7 @@ public class CreateMultipolygonAction extends JosmAction {
         final List<Command> list = removeTagsFromWaysIfNeeded(relation);
         final String commandName;
         if (existingRelation == null) {
-            list.add(new AddCommand(relation));
+            list.add(new AddCommand(selectedWays.iterator().next().getDataSet(), relation));
             commandName = getName(false);
         } else {
             list.add(new ChangeCommand(existingRelation, relation));
}}}

The other changes to `CreateMultipolygonAction.java` seem to be pretty harmless `Config.getPref()` changes, and my prefs match the default values.

Perhaps the ChangeCommand needs to pass the Dataset too?"	defect	closed	normal	17.11	Core multipoly	tested	fixed	multipolygon regression	sebastic