https://bugzilla.redhat.com/show_bug.cgi?id=2130607



--- Comment #24 from Alexander Ploumistos <[email protected]> ---
Hi Sébastien, well done.

Here's what's left:

- desktop-file-utils and libappstream-glib should be required only at build
time, did you have any reason to add them as run time deps? If not, remove
them.

- The screenshots that are included in the AppStream file are not 16:9 and one
of them has padding - this is what you see if you run appstream-util
validate-strict:

• aspect-ratio-invalid  : <screenshot> aspect ratio not 16:9
[https://atomes.ipcms.fr/wp-content/uploads/2022/08/Ni-Phth-1024x512.jpeg]
• style-invalid         : <image> has vertical padding
[https://atomes.ipcms.fr/wp-content/uploads/2022/08/lGeSe-1024x625.png]
• aspect-ratio-invalid  : <screenshot> aspect ratio not 16:9
[https://atomes.ipcms.fr/wp-content/uploads/2022/08/lGeSe-1024x625.png]
• aspect-ratio-invalid  : <screenshot> aspect ratio not 16:9
[https://atomes.ipcms.fr/wp-content/uploads/2022/08/workm2-1024x647.png]

While the other warnings from appstream-util in strict mode can be ignored, I
think that GNOME Software (and all the other software-center-type installers
built on the same base) will throw a tantrum.
See here for examples of good and bad screenshots:
https://www.freedesktop.org/software/appstream/docs/chap-Quickstart.html#qsr-app-screenshots-info

In GNOME, you can use the screenshot window sizer extension to easily get 16:9
application windows:
https://www.freedesktop.org/software/appstream/docs/chap-Quickstart.html#qsr-app-screenshots-info

Remember that if you want, you can also caption your images in the XML file,
e.g.:

    <screenshot type="default">
      <caption>Distance measurements on a Ni phthalocyanine unit cell</caption>
     
<image>https://atomes.ipcms.fr/wp-content/uploads/2022/08/Ni-Phth-1024x512.jpeg</image>
    </screenshot>


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