After Using "Gebiet erstellen" (X) with modifier ALT, you have to click twice to modify it

[anonymous]

What steps will reproduce the problem?

1. Create an area (building)
2. Use "Gebiet erstellen" (X) with modifier ALT to create another area connected to the original area
3. Try to modify the newly created area with "Gebiet erstellen" (X).
4. The first time you click it will not react.
5. The second time it reacts as expected

What is the expected result?

The first time you click it should react.

What happens instead?

The first time you click it will not react.

Please provide any additional information below. Attach a screenshot if possible.

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2018-05-31 00:51:20 +0200 (Thu, 31 May 2018)
Build-Date:2018-05-30 22:58:01
Revision:13878
Relative:URL: ^/trunk

Identification: JOSM/1.5 (13878 de) Windows 7 64-Bit
OS Build number: Windows 7 Home Premium (7601)
Memory Usage: 587 MB / 1801 MB (270 MB allocated, but free)
Java version: 1.8.0_171-b11, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1366x768
Maximum Screen Size: 1366x768
VM arguments: [-Djava.security.manager, -Djava.security.policy=file:<java.home>\lib\security\javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>\bin, -Djnlpx.origFilenameArg=%UserProfile%\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\56\1ee8cfb8-4db78e3b, -Djnlpx.remove=false, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.splashport=50491, -Djnlp.application.href=https://josm.openstreetmap.de/download/josm.jnlp, -Djnlpx.jvm=<java.home>\bin\javaw.exe]

Plugins:
+ HouseNumberTaggingTool (34109)
+ ImproveWay (17)
+ buildings_tools (34212)
+ continuosDownload (68)
+ terracer (34109)
+ wikipedia (v1.0.1)

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.

[anonymous]

The problem seems to be more general, after adding another area with ALT in X-mode, a click on the "Hinzufügen"-Button won't react.