left and right casing rendering not synchronous

[Klumbumbus]

What steps will reproduce the problem?

1. use left and right casing, e.g. the following mapcss style

way {
    right-casing-width: 6;
    left-casing-width: 6;
    right-casing-color: green;
    left-casing-color: green;
    right-casing-dashes: 55,25;
    left-casing-dashes: 55,25;
}

2. download a way e.g. ​way/279488783
3. move the map or move a way node or resize the JOSM window
4. somtimes the left- and rightcasing has an offset, see gif

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

I don't know if it is the same bug like #8429.

I'm currently working on Styles/Maxspeed to support maxspeed:direction:conditional and I need to switch from simple casing (where this bug does not appear) to left-casing + right-casing. However the offset doesn't look good.

Any chance this can be fixed soon?

Revision: 8916
Repository Root: http://josm.openstreetmap.de/svn
Relative URL: ^/trunk
Last Changed Author: Don-vip
Last Changed Date: 2015-10-20 01:22:27 +0200 (Tue, 20 Oct 2015)
Build-Date: 2015-10-20 01:32:17
URL: http://josm.openstreetmap.de/svn/trunk
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last Changed Rev: 8916

Identification: JOSM/1.5 (8916 en) Windows 7 32-Bit
Memory Usage: 742 MB / 742 MB (195 MB allocated, but free)
Java version: 1.8.0_60, Oracle Corporation, Java HotSpot(TM) Client VM
VM arguments: [-Djava.security.manager, -Djava.security.policy=file:C:\Program Files\Java\jre1.8.0_60\lib\security\javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>\bin, -Djnlpx.origFilenameArg=C:\Program Files\josm-latest-bla.jnlp, -Djnlpx.remove=true, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.heapsize=256m,768m, -Djnlpx.splashport=65073, -Djnlpx.jvm=<java.home>\bin\javaw.exe, -Djnlpx.vmargs=LURqYXZhLnV0aWwuQXJyYXlzLnVzZUxlZ2FjeU1lcmdlU29ydD10cnVlAA==]
Dataset consistency test: No problems found

Plugins:
- DirectDownload (31603)
- DirectUpload (31603)
- HouseNumberTaggingTool (31603)
- Mapillary (31612)
- OpeningHoursEditor (31603)
- PicLayer (31603)
- RoadSigns (31603)
- buildings_tools (31640)
- commons-imaging (31603)
- download_along (31603)
- editgpx (31603)
- imagery_offset_db (31646)
- measurement (31648)
- photo_geotagging (31603)
- photoadjust (31603)
- public_transport (31646)
- reltoolbox (31603)
- reverter (31625)
- tag2link (31603)
- tageditor (31615)
- tagging-preset-tester (31615)
- terracer (31603)
- turnlanes (31603)
- turnrestrictions (31638)
- undelete (31603)
- utilsplugin2 (31603)
- wikipedia (31603)

[Klumbumbus]

(gif file fixed)

[Klumbumbus]

I made a second screen capture. I move the node with the keyboard up. It seems the problem is the longer way the outer casing has compared to the shorter way the inner casing has in the right top corner. (However in the first part of the first gif there is offset even without sharp corners.)