Too many areas downloaded when multiple ways are selected

[GerdP]

What steps will reproduce the problem?

1. Select all ways of a relation, e.g. ​https://www.openstreetmap.org/relation/2029050
2. Use DownloadAlong with area 20 and distance 50

What is the expected result?

All areas along the ways are download

What happens instead?

Also some areas inside the polygon are selected. See also #17266.

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

While calculating the neededd areas the plugin wrongly "connects" ways.

Build-Date:2019-01-28 10:24:43
Revision:14748
Is-Local-Build:true

Identification: JOSM/1.5 (14748 SVN en) Windows 10 64-Bit
OS Build number: Windows 10 Home 1803 (17134)
Memory Usage: 718 MB / 1753 MB (254 MB allocated, but free)
Java version: 1.8.0_191-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1920x1080
Maximum Screen Size: 1920x1080
VM arguments: [-agentlib:jdwp=transport=dt_socket,suspend=y,address=localhost:50885, -ea, -Dfile.encoding=UTF-8]
Program arguments: [--debug]
Dataset consistency test: No problems found

Plugins:
+ OpeningHoursEditor (34867)
+ apache-commons (34506)
+ buildings_tools (34867)
+ continuosDownload (82)
+ download_along (34867)
+ ejml (34389)
+ geotools (34513)
+ jaxb (34678)
+ jts (34524)
+ o5m (34867)
+ opendata (34867)
+ pbf (34867)
+ poly (34867)
+ reltoolbox (34867)
+ reverter (34867)
+ utilsplugin2 (34867)

Last errors/warnings:
- W: Unable to request certificate of https://grca.nat.gov.tw
- W: No configuration settings found.  Using hardcoded default values for all pools.

[GerdP]

fixed with [o34869:34870]