IllegalArgumentException with negative dashes-offset

[mpasha]

What steps will reproduce the problem?

1.It appeared when adding maps to the style "dashes-offset: -5" and saving changes later.

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2017-10-16 23:15:27 +0200 (Mon, 16 Oct 2017)
Build-Date:2017-10-17 02:09:24
Revision:13009
Relative:URL: ^/trunk

Identification: JOSM/1.5 (13009 ru) Windows 10 64-Bit
OS Build number: Windows 10 Enterprise 2016 LTSB 1607 (14393)
Memory Usage: 465 MB / 989 MB (228 MB allocated, but free)
Java version: 1.8.0_131-b11, Oracle Corporation, Java HotSpot(TM) Client VM
Screen: \Display0 1366x768
Maximum Screen Size: 1366x768
VM arguments: [-Djosm.home=<josm.pref>]
Dataset consistency test: No problems found

Plugins:
+ BuildingGeneralization (16)
+ CADTools (1007)
+ DirectDownload (33160)
+ FastDraw (33583)
+ FixAddresses (33718)
+ HouseNumberTaggingTool (33714)
+ ImproveWay (12)
+ Mapillary (v1.5.7)
+ OpeningHoursEditor (33185)
+ ShapeTools (1220)
+ alignways (33182)
+ apache-commons (33668)
+ apache-http (32699)
+ buildings_tools (33004)
+ continuosDownload (64)
+ contourmerge (1032)
+ download_along (33710)
+ editgpx (33004)
+ ejml (32680)
+ geotools (33380)
+ imagery_offset_db (33547)
+ jogl (1.1.0)
+ jts (32699)
+ log4j (32699)
+ merge-overlap (33436)
+ namemanager (33306)
+ reltoolbox (33708)
+ reverter (33572)
+ tag2link (33382)
+ tageditor (33579)
+ terracer (33608)
+ todo (30303)
+ tofix (1505422613)
+ utilsplugin2 (33704)

Tagging presets:
+ https://raw.githubusercontent.com/ruosm-presets/literan-moscow/master/russian_shops.xml

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransport&zip=1
- https://github.com/igitov/forest-josm-style/archive/master.zip
- https://josm.openstreetmap.de/josmfile?page=Styles/NewHighwayColors&zip=1
- <josm.pref>\styles\indoor.mapcss
+ D:\Programs\JOSM_Portable\Map Styles\New.mapcss
- D:\Programs\JOSM_Portable\Map Styles\Ones test.mapcss
- http://mijndev.openstreetmap.nl/~allroads/JOSM/Styles/Road_Extended_JOSM_style.zip
- %UserProfile%\Downloads\Road_Extended_JOSM_style\Road_Extended_JOSM_style.mapcss
- D:\Programs\JOSM_Portable\Map Styles\Test\potlatch2.mapcss
- D:\Programs\JOSM_Portable\Map Styles\elemstyles1.mapcss
- D:\Programs\JOSM_Portable\Map Styles\Test\lane and road attributes.mapcss

Validator rules:
+ <josm.pref>\validator\indoorhelper.validator.mapcss

Last errors/warnings:
- W: Unable to convert property z-index to type class java.lang.Float: found 7 color: #836D30 of type class java.lang.String!
- W: Unable to convert property z-index to type class java.lang.Float: found 7 color: #836D30 of type class java.lang.String!
- W: Unable to convert property z-index to type class java.lang.Float: found 8 color: #836D30 of type class java.lang.String!
- W: Unable to convert property z-index to type class java.lang.Float: found 9 color: #836D30 of type class java.lang.String!
- W: Unable to convert property z-index to type class java.lang.Float: found 1 color: #836D30 of type class java.lang.String!
- W: Unable to convert property major-z-index to type class java.lang.Float: found 1 color: #836D30 of type class java.lang.String!
- W: Unable to convert property major-z-index to type class java.lang.Float: found 8 color: #836D30 of type class java.lang.String!
- W: Unable to convert property major-z-index to type class java.lang.Float: found +8 color: #836D30 of type class java.lang.String!
- W: Unable to convert property major-z-index to type class java.lang.Float: found -8 color: #836D30 of type class java.lang.String!
- E: Handled by bug report queue: java.lang.IllegalArgumentException: negative dash phase


=== REPORTED CRASH DATA ===
ComputeStyleListWorker#acceptDrawable:
 - osm: {Way id=-67887 version=0 MVT nodes=[{Node id=-67888 version=0 MV lat=49.509550246248224,lon=29.93479906976223}, {Node id=-67889 version=0 MV lat=49.508425149746415,lon=29.934804434180265}]}

BugReportExceptionHandler#handleException:
No data collected.

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: styled-map-renderer-808 (2268) of main
java.lang.IllegalArgumentException: negative dash phase
	at java.awt.BasicStroke.<init>(BasicStroke.java:208)
	at org.openstreetmap.josm.gui.mappaint.styleelement.LineElement.createImpl(LineElement.java:404)
	at org.openstreetmap.josm.gui.mappaint.styleelement.LineElement.createLine(LineElement.java:271)
	at org.openstreetmap.josm.gui.mappaint.ElemStyles.generateStyles(ElemStyles.java:377)
	at org.openstreetmap.josm.gui.mappaint.ElemStyles.getImpl(ElemStyles.java:229)
	at org.openstreetmap.josm.gui.mappaint.ElemStyles.getStyleCacheWithRange(ElemStyles.java:147)
	at org.openstreetmap.josm.gui.mappaint.ElemStyles.get(ElemStyles.java:126)
	at org.openstreetmap.josm.data.osm.visitor.paint.ComputeStyleListWorker.add(ComputeStyleListWorker.java:164)
	at org.openstreetmap.josm.data.osm.visitor.paint.ComputeStyleListWorker.visit(ComputeStyleListWorker.java:138)
	at org.openstreetmap.josm.data.osm.Way.accept(Way.java:218)
	at org.openstreetmap.josm.data.osm.visitor.paint.ComputeStyleListWorker.acceptDrawable(ComputeStyleListWorker.java:124)
	at org.openstreetmap.josm.data.osm.visitor.paint.ComputeStyleListWorker.computeDirectly(ComputeStyleListWorker.java:111)
	at org.openstreetmap.josm.data.osm.visitor.paint.ComputeStyleListWorker.compute(ComputeStyleListWorker.java:88)
	at org.openstreetmap.josm.data.osm.visitor.paint.ComputeStyleListWorker.compute(ComputeStyleListWorker.java:34)
	at java.util.concurrent.RecursiveTask.exec(RecursiveTask.java:94)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

[Klumbumbus]

The value of dashes-offset must be a number ≥0 (see wiki:Help/Styles/MapCSSImplementation)

[Don-vip]

In 13013/josm:

fix #15446 - robustness against negative dashes-offset