Support HTML code in GPX descriptions

[FrankOverman]

What steps will reproduce the problem?

1. Prep a track record in Locus Pro (Android) and include some named points in the track
2. Export the track in Locus Pro to a GPX file
3. Load the GPX file in JOSM (13170)

What is the expected result?

Track and Points on screen

What happens instead?

JOSM shows on screen XML flat text

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

Public GPX file, trace, here: ​http://www.openstreetmap.org/user/FrankOverman/traces/2551622

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2017-11-26 14:31:59 +0100 (Sun, 26 Nov 2017)
Revision:13170
Build-Date:2017-11-26 13:34:54
URL:http://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (13170 nl) Windows 7 64-Bit
OS Build number: Windows 7 Ultimate (7601)
Memory Usage: 349 MB / 2034 MB (193 MB allocated, but free)
Java version: 9.0.1+11, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1920x1080
Maximum Screen Size: 1920x1080
VM arguments: [--add-modules=ALL-DEFAULT,javafx.deploy, -Djava.security.manager, -Djava.security.policy=file:<java.home>\conf\security\javaws.policy, -DtrustProxy=true, -Djnlpx.home=<java.home>, -Djnlpx.origFilenameArg=%UserProfile%\AppData\Local\Temp\josm-26.jnlp, -Djnlpx.remove=false, --add-modules=java.activation,java.se.ee, --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=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/jdk.internal.loader=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, -Djava.util.Arrays.useLegacyMergeSort=true, -Djnlpx.jvm=<java.home>\bin\javaw.exe, --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

Last errors/warnings:
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.io.IOException: Attribution is not loaded yet
- W: java.net.SocketException: Network is unreachable: connect
- E: java.net.SocketException: Network is unreachable: connect
- W: org.openstreetmap.josm.io.OsmTransferException: Kon geen verbinding maken met de server van OSM. Controleer uw verbinding met internet.. Oorzaak: java.net.SocketException: Network is unreachable: connect
- E: Lokaliseren van afbeelding 'z-ico01' mislukt
- E: Lokaliseren van afbeelding 'z-ico01' mislukt
- E: Lokaliseren van afbeelding 'z-ico01' mislukt
- E: Lokaliseren van afbeelding 'battleship-3' mislukt

[FrankOverman]

GPX file with track recorded in Locus Pro (Android) including some named points

[FrankOverman]

Options used in Locus Pro for exporting recorded track to a GPX file: GPX version v1.1 (instead of v1.0).

[Don-vip]

HTML looks nice in layer information, but it must be avoided for markers:

[Don-vip]

#9103 is similar for KML/KMZ files.

[simon04]

In 15760/josm:

fix #15628 - Strip HTML code from GPX descriptions