Hints for spectral in main

Warnings

• asv-desktop-app-launchable-missing
  org.eu.encom.spectral.appdata.xml -
  This `desktop-application` component is missing a `desktop-id` launchable tag. This means that this application can not be launched and has no association with its desktop-entry file. It also means no icon data or category information from the desktop-entry file will be available, which will result in this application being ignored entirely.
• asv-category-invalid
  org.eu.encom.spectral.appdata.xml - Matrix
  The category name is not valid. Refer to the XDG Menu Specification for a list of valid category names.
• asv-category-invalid
  org.eu.encom.spectral.appdata.xml - Internet
  The category name is not valid. Refer to the XDG Menu Specification for a list of valid category names.
• asv-all-categories-ignored
  org.eu.encom.spectral.appdata.xml -
  All categories for this component have been ignored, either because they were invalid or because they are of low quality (e.g. custom 'X-' prefixed or toolkit ones like 'GTK' or 'Qt'). Please fix your category names, or add more categories.