id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
21404	Tagging presets: Setting default value in multiselect can disable the selection	skyper	team	"==== What steps will reproduce the problem?
1. Have preset with a default value set for a `<multiselect>` with the optional `default=""""`
1. Create a new object
1. Open preset and try to select values in the list.

==== What is the expected result?
The default value should be selected and selecting more value and deselecting the default value should be possible

==== What happens instead?
The value list is greyed out and no selection is possible, plus the default value is not selected.

==== Please provide any additional information below. Attach a screenshot if possible.
I also tried with tested (r18193) and there is no difference.
Without the optional `default=""""` the multiselect works as expected, besides #21397.
This is similar to #21385 but rather the opposite as it works if a valid combination of values is already tagged.

from [wiki:Presets/MastAndTower] ""Big communication tower"" preset:

{{{#!preset
    <multiselect key=""tower:type"" text=""Type of tower"" values_searchable=""true"" values_sort=""false"" default=""communication"" rows=""3"">
        <list_entry value=""communication"" display_value=""Communication tower"" icon=""presets/tower/communication.svg"" />
        <list_entry value=""observation"" display_value=""Observation tower"" icon=""presets/tower/observation.svg"" />
    </multiselect>
}}}


{{{
Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-10-04 16:05:23 +0200 (Mon, 04 Oct 2021)
Revision:18246
Build-Date:2021-10-04 14:06:33
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (18246 en) Linux Debian GNU/Linux 11 (bullseye)
Memory Usage: 247 MB / 256 MB (74 MB allocated, but free)
Java version: 17-ea+19-Debian-1, Debian, OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.metal.MetalLookAndFeel
Environment variable LANG: en_US.utf8
System property file.encoding: UTF-8
System property sun.jnu.encoding: UTF-8
Locale info: en_US
Numbers with default locale: 1234567890 -> 1234567890
Desktop environment: GNOME
libcommons-compress-java: libcommons-compress-java:all-1.20-1
libcommons-logging-java: libcommons-logging-java:all-1.2-2
fonts-noto: fonts-noto:all-20201225-1
VM arguments: [-Djosm.home=<josm.pref>/]
Dataset consistency test: No problems found

Plugins:
+ flatlaf (35799)
+ tagging-preset-tester (35640)
}}}
"	defect	closed	normal	21.10	Core	tested	fixed	template_report multiselect default value