changeset manager: tags tab: width of column (almost) not changeable

[skyper]

What steps will reproduce the problem?

1. Have a changeset with a long tag value. (e.g. ​79130450)
2. In changeset manager click on "Tags" tab
3. try to change the width of the columns hovering the mouse on the middle of the title row

What is the expected result?

The width is easily changeable like in the other three tabs

What happens instead?

The width is not or almost not changeable. I noticed sometimes a small jump but that was all

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

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-01-05 23:29:48 +0100 (Sun, 05 Jan 2020)
Revision:15644
Build-Date:2020-01-06 02:30:57
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (15644 en) Linux Debian GNU/Linux 10 (buster)
Memory Usage: 273 MB / 964 MB (57 MB allocated, but free)
Java version: 11.0.5+10-post-Debian-1deb10u1, Debian, OpenJDK 64-Bit Server VM
Screen: :0.0 1366x768
Maximum Screen Size: 1366x768
Java package: openjdk-11-jre:amd64-11.0.5+10-1~deb10u1
Java ATK Wrapper package: libatk-wrapper-java:all-0.33.3-22
libcommons-compress-java: libcommons-compress-java:all-1.18-2
libcommons-logging-java: libcommons-logging-java:all-1.2-2
fonts-noto: fonts-noto:all-20181227-1
Dataset consistency test: No problems found

Plugins:
+ ImportImagePlugin (35248)
+ Mapillary (1.5.20)
+ apache-commons (35092)
+ apache-http (35092)
+ conflation (0.6.4)
+ ejml (35122)
+ geotools (35169)
+ imagery_offset_db (35248)
+ jaxb (35092)
+ jna (35092)
+ jts (35122)
+ log4j (35092)
+ opendata (35248)
+ reverter (35248)
+ tag2link (35248)
+ undelete (35248)
+ utilsplugin2 (35248)
+ wikipedia (1.1.3)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/Crafts&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/LaneAttributes&zip=1
+ https://github.com/kendzi/Simple3dBuildingsPreset/releases/download/0.9_2018-05-08/s3db-preset.zip

Map paint styles:
+ https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1

Validator rules:
+ https://josm.openstreetmap.de/josmfile?page=Rules/GermanySpecific&zip=1

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.
- W: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out
- E: java.util.concurrent.ExecutionException: org.openstreetmap.josm.io.OsmApiException: ResponseCode=429, Error Body=<<?xml version="1.0" encoding="UTF-8"?>
- W: java.net.SocketTimeoutException: Read timed out
- E: Failed to locate image 'https://www.liikennevirasto.fi/livi-theme/images/general/liikennevirasto_logo_2x.png'
- E: Failed to locate image 'https://www.liikennevirasto.fi/livi-theme/images/general/liikennevirasto_logo_2x.png'

[skyper]

screenshot