Hints for 4pane in universe

4Pane.desktop ⚙ amd64

asv-cid-desktopapp-is-not-rdns
4Pane.appdata.xml:4 - 4Pane.desktop
The component ID is not a reverse domain-name. Please update the ID to avoid future issues and be compatible with all AppStream implementations. You may also consider to update the name of the accompanying .desktop file to follow the latest version of the Desktop-Entry specification and use a rDNS name for it as well. In any case, do not forget to mention the new desktop-entry in a <launchable/> tag for this component to keep the application launchable from software centers and the .desktop file data associated with the metainfo data.

asv-screenshot-media-url-not-secure
4Pane.appdata.xml:24 - http://www.4Pane.co.uk/4Pane624x351.png
Consider using a secure (HTTPS) URL to reference this screenshot image or video.
asv-cid-has-number-prefix
4Pane.appdata.xml:4 - 4Pane.desktop: 4Pane → _4Pane
The component ID contains a segment starting with a number. Starting a segment of the reverse-DNS ID with a number is strongly discouraged, to keep interoperability with other tools such as D-Bus. Ideally, prefix these segments with an underscore.
asv-url-not-secure
4Pane.appdata.xml:27 - http://www.4pane.co.uk
Consider using a secure (HTTPS) URL for this web link.