Arch Linux

Description:

Attempting to export 2D plan to SVG format produces an empty file and the following output on terminal:

```
java.lang.NoClassDefFoundError: org/freehep/graphicsio/svg/SVGGraphics2D
at com.eteks.sweethome3d.swing.PlanComponent.exportToSVG(Unknown Source)
at com.eteks.sweethome3d.swing.PlanComponent.exportData(Unknown Source)
at com.eteks.sweethome3d.swing.MultipleLevelsPlanPanel.exportData(Unknown Source)
at com.eteks.sweethome3d.swing.HomePane.exportToSVG(Unknown Source)
at com.eteks.sweethome3d.viewcontroller.HomeController$38.call(Unknown Source)
at com.eteks.sweethome3d.viewcontroller.HomeController$38.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at com.eteks.sweethome3d.viewcontroller.ThreadedTaskController$1.run(Unknown Source)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.ClassNotFoundException: org.freehep.graphicsio.svg.SVGGraphics2D
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 13 more
```

Additional info:
* package version(s): sweethome3d 7.0.2-1
* config and/or log files etc: Java runtime is java-11-openjdk. If using java-18-openjdk, the program falls back to java-11-openjdk and the issue persists.
* link to upstream bug report, if any: discussed at https://www.sweethome3d.com/support/forum/viewthread_thread,11910

If you download the jnlp version from https://www.sweethome3d.com/download.jsp and run with javaws on the same system, SVG export works correctly without error.

Steps to reproduce:

1. Create or open a project file
2. Select `Plan` -> `Export to SVG Format` command and specify filename.