Spliting ways give wrong message in the Command Stack

[rickmastfan67]

Steps to reproduce:

1. Create a 3 node way.
2. Split way at the middle node.

What should happen:
The command stack says the following: Sequence: Split way 0 (3 nodes) [id: 0] into 2 parts

What does happen:
The command stack says the following: Sequence: Split way 0 (3 nodes) [id: 0] into 1 part

When you expand the '+' that is in-front of the message, you can clearly see there are 2 parts. The original and the new part. Thus, the message should say '2' instead of '1'.

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-02-14 23:17:40 +0100 (Sun, 14 Feb 2016)
Build-Date:2016-02-15 02:31:56
Revision:9805
Relative:URL: ^/trunk

Identification: JOSM/1.5 (9805 en) Windows 7 64-Bit
Memory Usage: 454 MB / 1820 MB (85 MB allocated, but free)
Java version: 1.8.0_73-b02, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Dataset consistency test: No problems found

Plugins:
- OpeningHoursEditor (31772)
- buildings_tools (31895)
- measurement (31895)
- osmarender (31772)
- reverter (32005)
- turnrestrictions (31895)
- undelete (31895)
- utilsplugin2 (32018)

[simon04]

In 9872/josm:

fix #12535 - Splitting ways give wrong message in the Command Stack