Duplicated data detected while there is none

[Robert-André Mauchin]

Given this metainfo:

<?xml version="1.0" encoding="UTF-8"?>
<component type="desktop-application">
  <id>org.merkaartor.merkaartor</id>
  <launchable type="desktop-id">org.merkaartor.merkaartor.desktop</launchable>
  <name>Merkaartor</name>
  <summary>OpenStreetMap editor</summary>
  <metadata_license>CC0-1.0</metadata_license>
  <project_license>GPL-2.0</project_license>
  <description>
    <p>Merkaartor is a map editor for OpenStreetMap.org, the free editable map of the whole world. Features:</p>
    <ul>
      <li>Download from and upload to the OpenStreetMap server</li>
      <li>Open .osm and .gpx files</li>
      <li>Create and move trackpoints, ways, and areas</li>
      <li>Add tags, delete features</li>
      <li>Reverse, split and join ways</li>
      <li>Visualize some leisure/landuse areas and road types</li>
      <li>Displaying GPS information</li>
    </ul>
  </description>
  <screenshots>
    <screenshot type="default">
      <caption>Merkaartor 0.15.3 with Mapnik style</caption>
​      <image>https://wiki.openstreetmap.org/w/images/0/04/Merkaartor_0.15.3.png</image>
    </screenshot>
    <screenshot>
      <caption>Merkaartor 0.15.3 with Maxspeed style</caption>
​      <image>https://wiki.openstreetmap.org/w/images/b/b4/Merkaartor_0.15.3_maxspeed.png</image>
    </screenshot>
    <screenshot>
      <caption>Merkaartor 0.15.3 showing the fully localized GUI</caption>
​      <image>https://wiki.openstreetmap.org/w/images/4/48/Merkaartor_0.15.3_i18n.png</image>
    </screenshot>
    <screenshot>
      <caption>Merkaartor 0.15.3 with WMS background and semi-transparent map layer</caption>
​      <image>https://wiki.openstreetmap.org/w/images/c/c9/Merkaartor_0.15.3_wms.png</image>
    </screenshot>
  </screenshots>
  <url type="bugtracker">https://github.com/openstreetmap/merkaartor/issues</url>
  <url type="homepage">http://merkaartor.be/</url>
  <update_contact>[e-mail]</update_contact>
  <translation type="qt">merkaartor</translation>
</component>

When trying to validate it, I get:

appstream-util validate-relax --nonet org.merkaartor.merkaartor.appdata.xml 
org.merkaartor.merkaartor.appdata.xml: FAILED:
• duplicate-data        : <screenshot> has duplicated data
Validation of files failed

And I really don't understand why.

[Richard Hughes]

Hmm, I'm not sure why either. Can you have a look at libappstream-glib/as-app-validate.c and see if you can see anything fishy please?