Ability to create layer groups

[antoine.riche@…]

Enhancement request

When mapping railway stations we often use a large number of layers : background maps (as pictures or local TMS) and georeferenced photos. It would be particularly handy to be able to create groups of layers and have the ability to display or hide all layers in a group with a single click, rather than (de)activating every single layer. The layer groups would need to be stored when saving a session. The use case for us is to group layers by level for indoor mapping, but there could be others.

QGIS provides this functionnality, and could be inspiring for the UX design to create groups, move layers into or across groups, etc.

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: 2020-01-27 03:05:45 +0100 (Mon, 27 Jan 2020)
Build-Date:2020-01-27 02:31:03
Revision:15786
Relative:URL: ^/trunk

Identification: JOSM/1.5 (15786 fr) Linux Ubuntu 18.04.3 LTS
Memory Usage: 1659 MB / 1820 MB (167 MB allocated, but free)
Java version: 1.8.0_242-8u242-b08-0ubuntu3~18.04-b08, Private Build, OpenJDK 64-Bit Server VM
Screen: :0.0 1920x1080, :0.1 1280x1024
Maximum Screen Size: 1920x1080
Java package: openjdk-8-jre:amd64-8u242-b08-0ubuntu3~18.04
Java ATK Wrapper package: libatk-wrapper-java:all-0.33.3-20ubuntu0.1
libcommons-compress-java: libcommons-compress-java:all-1.18-1~18.04
libcommons-logging-java: libcommons-logging-java:all-1.2-2
fonts-noto: fonts-noto:-
VM arguments: [-Djosm.pref=<josm.pref>]
Dataset consistency test: No problems found

Plugins:
+ Mapillary (1.5.20)
+ OpenStreetCam (280)
+ OpeningHoursEditor (35250)
+ PicLayer (35313)
+ apache-commons (35092)
+ apache-http (35092)
+ buildings_tools (35248)
+ changeset-viewer (22)
+ continuosDownload (91)
+ ejml (35122)
+ geotools (35169)
+ indoorhelper (35248)
+ jaxb (35092)
+ jna (35092)
+ jts (35122)
+ opendata (35313)
+ photo_geotagging (35313)
+ photoadjust (35313)
+ reverter (35313)
+ todo (30306)
+ undelete (35313)
+ utilsplugin2 (35248)

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransportV2&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Sidewalks&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Modified&zip=1
- ${HOME}/Bureau/railway-station.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
+ ${HOME}/Carto'Cité/Projets/1-Cloud/Île-de-France Mobilités/KeepItClean/Outils/Style_JOSM/cycleway.mapcss
- <josm.userdata>/styles/sit.mapcss

Validator rules:
+ ${HOME}/Bureau/railway-station.validator.mapcss

Last errors/warnings:
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- E: Impossible de trouver l'image "toilet_wheelchair_icon.png"
- W: java.net.SocketTimeoutException: Read timed out

[skyper]

See also #12872