Error when entering a directory containing a file with a non-ASCII character in its name

[pdm@…]

What steps will reproduce the problem?

1. Make a directory with a gpx file having a non-ASCII character in its name; in my case there is a file named `20180523 182800 Horské kolo.gpx'.
2. Invoke Open File dialog.
3. Try to enter the directory.

Happens in both current tested and latest (13880).

What is the expected result?

Open File dialog displays content of the directory.

What happens instead?

Bug dialog appears.

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: 2018-05-31 00:51:20 +0200 (Thu, 31 May 2018)
Build-Date:2018-05-30 22:58:01
Revision:13878
Relative:URL: ^/trunk

Identification: JOSM/1.5 (13878 en) Linux Debian GNU/Linux 9.4 (stretch)
Memory Usage: 482 MB / 910 MB (379 MB allocated, but free)
Java version: 1.8.0_171-8u171-b11-1~deb9u1-b11, Oracle Corporation, OpenJDK 64-Bit Server VM
Screen: :0.0 1920x1200
Maximum Screen Size: 1920x1200
Java package: openjdk-8-jre:amd64-8u171-b11-1~deb9u1
Java ATK Wrapper package: libatk-wrapper-java:all-0.33.3-13+deb9u1

Plugins:
+ Tracer (34109)
+ osmarender (34096)
+ routes (34110)
+ tagging-preset-tester (34109)

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.
- E: Handled by bug report queue: java.nio.file.InvalidPathException: Malformed input or input contains unmappable characters: ${HOME}/osm/neslovice/20180523 182800 Horsk�� kolo.gpx


=== REPORTED CRASH DATA ===
BugReportExceptionHandler#handleException:
No data collected.

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: Basic L&F File Loading Thread (49)
java.nio.file.InvalidPathException: Malformed input or input contains unmappable characters: /home/pdm/osm/neslovice/20180523 182800 Horsk�� kolo.gpx
	at sun.nio.fs.UnixPath.encode(UnixPath.java:147)
	at sun.nio.fs.UnixPath.<init>(UnixPath.java:71)
	at sun.nio.fs.UnixFileSystem.getPath(UnixFileSystem.java:281)
	at java.nio.file.Paths.get(Paths.java:84)
	at sun.awt.shell.ShellFolder.getShellFolder(ShellFolder.java:247)
	at javax.swing.filechooser.FileSystemView.getFiles(FileSystemView.java:490)
	at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread.run0(BasicDirectoryModel.java:239)
	at javax.swing.plaf.basic.BasicDirectoryModel$LoadFilesThread.run(BasicDirectoryModel.java:228)

[stoecker]

How do you start JOSM?

See e.g. #14596.

[pdm@…]

I had an old setting of LANG=czech for JOSM, which is no longer recognized by locale. Switching LANG to C.UTF-8 or cs_CZ.UTF-8 helps. Thank you for the hint, closing.

[stoecker]

Closed as duplicate of #14596.