Text editor has strange undo/redo behavior

[tguen]

What steps will reproduce the problem?

1. click the Add button on the tags panel
2. type "asdf" in the key field
3. press ctrl+z until the text box stops changing

What is the expected result?

"asdf"->"asd"->"as"->"a"->""

What happens instead?

"asdf"->""->"asdf"->"asd"->""->"asd"->"as"->"ascent"->""->"as"->""->"ascent"->""->"as"->"a"->"access"->""->"a"->""->"access"->""->"a"->""

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

Obviously autocompleted text is being pushed to the undo stack, not sure why the blanks and duplicates are there though.

This doesn't apply only to the tag editor. You can see similar behavior in the find dialog for example.

Revision:18715
Is-Local-Build:true
Build-Date:2023-04-29 13:48:46

Identification: JOSM/1.5 (18715 SVN en) Linux Arch Linux
Memory Usage: 371 MB / 3936 MB (225 MB allocated, but free)
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