Exporting a support layer duplicate doesn't export an edited timestamp

[StephaneP]

What steps will reproduce the problem?

1. Load some images, get these pack for example: https://josm.openstreetmap.de/attachment/ticket/21330/bug_support_layer_A.zip
2. Export a gpx from the images location
3. Load the gpx in Josm
4. start a image/gpx correlation, and use the previous gpx as a support layer
5. Edit the first node timestamp, from

2021-09-07T14:51: 45 .265Z to
2021-09-07T14:51: 40 .265Z

7. Export the support layer to a gpx file
8. open the exported gpx in a text editor and look at the first trackpoint's timestamp

What is the expected result?

2021-09-07T14:51:40.265Z

What happens instead?

2021-09-07T14:51:45.Z

the second is wrong and there are no subseconds anymore

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: 2021-09-15 00:16:42 +0200 (Wed, 15 Sep 2021)
Build-Date:2021-09-15 01:31:02
Revision:18225
Relative:URL: ^/trunk

Identification: JOSM/1.5 (18225 en) Windows 10 64-Bit
OS Build number: Windows 10 Pro 2009 (19043)
Memory Usage: 1549 MB / 14564 MB (1158 MB allocated, but free)
Java version: 1.8.0_191-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1920×1080 (scaling 1.00×1.00) \Display1 2560×1440 (scaling 1.00×1.00)
Maximum Screen Size: 2560×1440
Best cursor sizes: 16×16→32×32, 32×32→32×32
System property file.encoding: Cp1252
System property sun.jnu.encoding: Cp1252
Locale info: en_FR
Numbers with default locale: 1234567890 -> 1234567890
Dataset consistency test: No problems found

Plugins:
+ DxfImport (1014)
+ Mapillary (2.0.0-alpha.36-dirty)
+ OpeningHoursEditor (35640)
+ PicLayer (1.0.1)
+ apache-commons (35524)
+ apache-http (35589)
+ areaselector (368)
+ austriaaddresshelper (1597341117)
+ cadastre-fr (35797)
+ continuosDownload (99)
+ contourmerge (v0.1.8)
+ ejml (35458)
+ geotools (35458)
+ jaxb (35543)
+ jna (35662)
+ jts (35458)
+ log4j (35458)
+ measurement (35640)
+ opendata (35803)
+ photo_geotagging (35783)
+ photoadjust (35770)
+ reverter (35732)
+ shrinkwrap (v1.0.4)
+ tageditor (35640)
+ todo (30306)
+ turnlanes-tagging (288)
+ turnrestrictions (35640)
+ undelete (35640)
+ utilsplugin2 (35792)

Tagging presets:
+ %UserProfile%\Documents\Gitlab\preset-josm-collectivites\Presets-collectivités.xml
+ https://josm.openstreetmap.de/josmfile?page=Presets/LaneAttributes&zip=1

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Enhanced_Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
- https://raw.githubusercontent.com/species/josm-preset-traffic_sign_direction/master/direction.mapcss
+ %UserProfile%\Documents\GitHub\MapCSS-JOSM-Bicycle\cycleway.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/iD&zip=1
- https://github.com/bastik/mapcss-tools/raw/osm/mapnik2mapcss/osm-results/mapnik.zip
- https://josm.openstreetmap.de/josmfile?page=Styles/NewHighwayColors&zip=1

Last errors/warnings:
- 17440.083 W: java.net.SocketTimeoutException: Read timed out. Cause: java.net.SocketTimeoutException: Read timed out
- 17440.706 W: java.net.SocketTimeoutException: Read timed out. Cause: java.net.SocketTimeoutException: Read timed out
- 17440.881 W: java.net.SocketTimeoutException: Read timed out. Cause: java.net.SocketTimeoutException: Read timed out
- 17441.222 W: java.net.SocketTimeoutException: Read timed out. Cause: java.net.SocketTimeoutException: Read timed out
- 17446.577 W: java.net.SocketTimeoutException: Read timed out. Cause: java.net.SocketTimeoutException: Read timed out

[Don-vip]

In 18233/josm:

see #21144 - fix #21330 - fix #21335 - proper handling of correlation support layers in "duplicate" and "gpx export" actions

[Don-vip]

Milestone renamed