Allow sorting of table content in changeset manager to facilitate finding related rows

[schoschi]

What steps will reproduce the problem?

1. Menu > Windows > Changeset manager (DE: Änderungssatzverwaltung)
2. My Changesets and select a changeset where you a) have a little more rows and b) you did split some ways and c) you did create as well as update objects
3. Download changeset content, switch to tab content

What is the expected result?

I can clich any table header to sort table e.g. by "Name" column, so all Elements with same name are directly next to each other and I can easily check the ways I did split are split correctly: All related ways are next to each other, and I can simply go trough all groups from top to bottom

What happens instead?

The table is always sorted by created/updated so the ways you did split are scattered across the table - this makes it hard to check the split was correct: I must manually look whether objects with similar names exist and I must memorize (despite arbitrary processing sequence) which linkes I did already check

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

I also tried with Java version: 11.0.5+10, AdoptOpenJDK, OpenJDK 64-Bit Server VM

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-02-26 10:50:27 +0100 (Wed, 26 Feb 2020)
Revision:15937
Build-Date:2020-02-26 09:52:41
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (15937 de) Windows 10 64-Bit
OS Build number: Windows 10 Pro 1909 (18363)
Memory Usage: 630 MB / 4078 MB (281 MB allocated, but free)
Java version: 11.0.5+10, AdoptOpenJDK, OpenJDK 64-Bit Server VM
Screen: \Display0 3240x2160, \Display1 2560x1440
Maximum Screen Size: 3240x2160
Dataset consistency test: No problems found

Plugins:
+ DirectUpload (35248)
+ InfoMode (35248)
+ Mapillary (1.5.20)
+ OpeningHoursEditor (35250)
+ PicLayer (35313)
+ ShapeTools (1240)
+ apache-commons (35092)
+ apache-http (35092)
+ buildings_tools (35248)
+ contourmerge (v0.1.6)
+ jna (35092)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/SkiingTrail&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Mountains&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Heritage&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/OpenPisteMap&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/NewTags&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/Enhanced_Lane_and_Road_Attributes&zip=1

[schoschi]

screenshot