Exempt `@` from `taxi:conditional=` in checking for suspicious chracters when pasting tags

[anonymous]

What steps will reproduce the problem?

1. Copy a taxi:conditional=* tag
2. Paste the tag

What is the expected result?

No warning/confirmation pop-up, as with other *:conditional= keys.

What happens instead?

"Do you want to paste this tag?" pops up suggesting it is suspicious to have @ in taxi:conditional=*'s value.

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

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-02-01 01:10:57 +0100 (Sat, 01 Feb 2020)
Revision:15806
Build-Date:2020-02-01 00:12:46
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (15806 en) Windows 10 64-Bit
OS Build number: Windows 10 Home 1903 (18362)
Memory Usage: 380 MB / 2048 MB (43 MB allocated, but free)
Java version: 10+46, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1920x1200
Maximum Screen Size: 1920x1200
VM arguments: [--add-modules=ALL-DEFAULT,javafx.deploy, -Djava.security.manager, -Djava.util.Arrays.useLegacyMergeSort=true, --add-modules=java.scripting,java.sql, --add-exports=java.base/sun.security.util=ALL-UNNAMED, --add-exports=java.base/sun.security.x509=ALL-UNNAMED, --add-exports=java.desktop/com.apple.eawt=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=javafx.graphics/com.sun.javafx.application=ALL-UNNAMED, --add-exports=jdk.deploy/com.sun.deploy.config=ALL-UNNAMED, --add-opens=java.base/java.lang=ALL-UNNAMED, --add-opens=java.base/java.nio=ALL-UNNAMED, --add-opens=java.base/jdk.internal.loader=ALL-UNNAMED, --add-opens=java.base/jdk.internal.ref=ALL-UNNAMED, --add-opens=java.desktop/javax.imageio.spi=ALL-UNNAMED, --add-opens=java.desktop/javax.swing.text.html=ALL-UNNAMED, --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED, -Djnlpx.jvm=<java.home>\bin\javaw.exe, -Djnlpx.home=<java.home>, -Djnlpx.remove=false, -Djnlpx.offline=false, -Djnlpx.relaunch=true, -Djnlpx.session.data=C:\Users\KENLEE~1\AppData\Local\Temp\session13668772035324546123, -Djnlpx.heapsize=-1,2147483648, -Djava.security.policy=file:<java.home>\conf\security\javaws.policy, -DtrustProxy=true, -Djnlpx.origFilenameArg=C:\Soft\JOSM\josm.jnlp, --illegal-access=deny, --add-modules=ALL-DEFAULT, --add-exports=java.base/com.sun.net.ssl.internal.ssl=jdk.deploy, --add-exports=java.base/jdk.internal.misc=jdk.deploy, --add-exports=java.base/jdk.internal.util.jar=jdk.deploy, --add-exports=java.base/sun.net.www=jdk.deploy, --add-exports=java.base/sun.net.www.protocol.file=jdk.deploy, --add-exports=java.base/sun.net.www.protocol.http=jdk.deploy, --add-exports=java.base/sun.net.www.protocol.http.ntlm=jdk.deploy, --add-exports=java.base/sun.net.www.protocol.https=jdk.deploy, --add-exports=java.base/sun.net.www.protocol.jar=jdk.deploy, --add-exports=java.base/sun.nio=jdk.deploy, --add-exports=java.base/sun.reflect.misc=jdk.deploy, --add-exports=java.base/sun.security.action=jdk.deploy, --add-exports=java.base/sun.security.pkcs=jdk.deploy, --add-exports=java.base/sun.security.provider=jdk.deploy, --add-exports=java.base/sun.security.provider.certpath=jdk.deploy, --add-exports=java.base/sun.security.rsa=jdk.deploy, --add-exports=java.base/sun.security.ssl=jdk.deploy, --add-exports=java.base/sun.security.timestamp=jdk.deploy, --add-exports=java.base/sun.security.util=jdk.deploy, --add-exports=java.base/sun.security.validator=jdk.deploy, --add-exports=java.base/sun.security.x509=jdk.deploy, --add-exports=java.base/sun.usagetracker=jdk.deploy, --add-exports=java.desktop/sun.awt=jdk.deploy, --add-exports=java.naming/com.sun.jndi.toolkit.url=jdk.deploy, --add-exports=java.base/jdk.internal.misc=jdk.javaws, --add-exports=java.desktop/com.sun.media.sound=jdk.javaws, --add-exports=java.desktop/sun.awt=jdk.javaws, --add-exports=java.desktop/sun.awt.image=jdk.javaws, --add-exports=java.base/jdk.internal.misc=jdk.plugin, --add-exports=java.base/sun.net=jdk.plugin, --add-exports=java.base/sun.net.www=jdk.plugin, --add-exports=java.base/sun.net.www.protocol.jar=jdk.plugin, --add-exports=java.base/sun.security.action=jdk.plugin, --add-exports=java.base/sun.security.util=jdk.plugin, --add-exports=java.desktop/com.sun.media.sound=jdk.plugin, --add-exports=java.desktop/java.awt.peer=jdk.plugin, --add-exports=java.desktop/sun.applet=jdk.plugin, --add-exports=java.desktop/sun.applet.resources=jdk.plugin, --add-exports=java.desktop/sun.awt=jdk.plugin, --add-exports=java.desktop/sun.awt.windows=jdk.plugin, --add-exports=java.desktop/sun.swing=jdk.plugin, --add-exports=jdk.jsobject/jdk.internal.netscape.javascript.spi=jdk.plugin, --add-exports=java.desktop/sun.awt.image=jdk.plugin, -Djdk.module.main=jdk.plugin]
Dataset consistency test: No problems found

Plugins:
+ CADTools (1008)
+ Create_grid_of_ways (35248)
+ CustomizePublicTransportStop (35248)
+ EasyPresets (1537621333)
+ ImproveOsm (191)
+ Mapillary (1.5.20)
+ OpeningHoursEditor (35250)
+ ShapeTools (1240)
+ alignways (35248)
+ apache-commons (35092)
+ apache-http (35092)
+ auto_tools (73)
+ buildings_tools (35248)
+ changeset-viewer (22)
+ imagery_offset_db (35248)
+ jaxb (35092)
+ jna (35092)
+ markseen (14)
+ measurement (35248)
+ merge-overlap (35248)
+ pt_assistant (34678)
+ public_transport (35313)
+ reverter (35313)
+ routes (35248)
+ tageditor (35258)
+ turnlanes (35313)
+ turnlanes-tagging (283)
+ turnrestrictions (35313)
+ undelete (35313)
+ utilsplugin2 (35248)
+ waydownloader (35092)

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransport&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransportV2&zip=1
+ https://pasharm.github.io/New_basic_style_for_JOSM/New_basic_style.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/PTStops&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Enhanced_Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/iD&zip=1
- https://github.com/bastik/mapcss-tools/raw/osm/mapnik2mapcss/osm-results/mapnik.zip
+ https://josm.openstreetmap.de/josmfile?page=Styles/MapWithAI&zip=1

Last errors/warnings:
- W: Unable to convert property color to type class java.awt.Color: found # of type class java.lang.String!
- W: Unable to convert property color to type class java.awt.Color: found # of type class java.lang.String!
- W: Unable to convert property color to type class java.awt.Color: found # of type class java.lang.String!
- W: Unable to convert property color to type class java.awt.Color: found # of type class java.lang.String!
- W: Unable to convert property color to type class java.awt.Color: found # of type class java.lang.String!
- W: Unable to convert property color to type class java.awt.Color: found # of type class java.lang.String!
- W: Unable to convert property color to type class java.awt.Color: found # of type class java.lang.String!
- W: Unable to convert property color to type class java.awt.Color: found # of type class java.lang.String!
- W: Unable to convert property color to type class java.awt.Color: found # of type class java.lang.String!
- W: java.io.IOException: Tags to paste are not valid.