Preferences: Missing warning about restart when changing icon size

[skyper]

What steps will reproduce the problem?

1. start JOSM with empty preferences
2. open preferences
3. enable expert mode
4. open advanced preferences
5. search for iconsize
6. change some values
7. close preferences by clicking on "OK"

What is the expected result?

Either the icon sizes change right away or a warning dialog with an option to restart

What happens instead?

No change in size and no dialog

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

Offline mode does not matter here.
Have the same pronlem with `Dracula" mode from flatlaf plugin.

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-11-03 01:08:48 +0100 (Wed, 03 Nov 2021)
Revision:18306
Build-Date:2021-11-03 00:29:02
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (18306 en) Linux Debian GNU/Linux 11 (bullseye)
Memory Usage: 165 MB / 256 MB (55 MB allocated, but free)
Java version: 17-ea+19-Debian-1, Debian, OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.metal.MetalLookAndFeel
Desktop environment: GNOME
VM arguments: [-Djosm.home=<josm.pref>]
Program arguments: [--offline=all]
Dataset consistency test: No problems found

Last errors/warnings:
- 00000.923 W: JOSM is running in offline mode. This resource will not be available: All

[anonymous]

21 months later. Cannot scale the icons.