id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
18709	"Add Tag Dialog: Corrupt key/value added silently with ""Recent tags with existing key"" enabled"	skyper	team	"==== What steps will reproduce the problem?
1. Create new layer
1. Add a node (A) and select it
1. Open Add Tag Dialog and set ""Recent tags with existing key"" in context menu to ""enable""
1. Add tag `crossing=uncontrolled` to A
1. Add another node (B) and select it
1. Add tags `crossing=unmarked` and `crossing:barrier=no` to B
1. select A and open Add Tag Dialog
1. double click on `crossing=unmarked`

==== What is the expected result?
The warning about overwriting an existing tag and `crossing=unmarked` on A after ""OK""

==== What happens instead?
`crossing:barrier=unmarked` is silently added to A

==== Please provide any additional information below. Attach a screenshot if possible.
Might be a regression. Mark this as critical as adding corrupt tags is bad.

Tried to save it into a session but the add tag history is not saved.

{{{
Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-02-12 00:06:43 +0100 (Wed, 12 Feb 2020)
Revision:15845
Build-Date:2020-02-12 02:30:56
URL:https://josm.openstreetmap.de/svn/trunk
}}}
"	defect	closed	critical	20.02	Core	latest	fixed	template_report add tag recent existing key