Complain about invisible characters in tags

[mkoniecz]

What steps will reproduce the problem?

1. Load ​https://www.openstreetmap.org/way/40545876/history in version 4
2. Run validator

What is the expected result?

Validator complains about invisible characters and offers to remove them.

What happens instead?

Unknown property value - Value 'ground‬' for key 'surface' is unknown, maybe 'ground' is meant? (1)

It complains but in way that is extremely confusing.

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

This specific issue should be soon gone as result of ​https://wiki.openstreetmap.org/wiki/Mechanical_Edits/Mateusz_Konieczny_-_bot_account/elimination_of_nonprintable_characters_at_start_or_end_of_tags but just this specific malformed ground value was present 6k times

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2019-03-24 22:30:59 +0100 (Sun, 24 Mar 2019)
Build-Date:2019-03-25 02:30:52
Revision:14927
Relative:URL: ^/trunk

Identification: JOSM/1.5 (14927 en) Linux Ubuntu 16.04.6 LTS
Memory Usage: 392 MB / 869 MB (166 MB allocated, but free)
Java version: 1.8.0_201-b09, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: :0.0 1920x1080
Maximum Screen Size: 1920x1080
Dataset consistency test: No problems found

Plugins:
+ OpeningHoursEditor (34867)
+ buildings_tools (34904)
+ continuosDownload (82)
+ imagery_offset_db (34867)
+ measurement (34867)
+ reverter (34946)
+ todo (30306)

Validator rules:
+ ${HOME}/Desktop/tmp/unnecessary.validator.mapcss

Last errors/warnings:
- W: Invalid jar file ''<josm.userdata>/plugins/reverter.jar.new'' (exists: false, canRead: false)
- W: No configuration settings found.  Using hardcoded default values for all pools.
- W: java.net.SocketException: Socket closed
- E: java.net.SocketException: Socket closed