D23306: Add AppStream metadata file

[Friedrich W. H. Kossebau]

kossebau added a comment.


  In D23306#515662 <https://phabricator.kde.org/D23306#515662>, @mak wrote:
  
  > In D23306#515616 <https://phabricator.kde.org/D23306#515616>, @kossebau wrote:
  >
  > > Thanks! Though reading it, leaves open questions with me:
  > >
  > > - what is meant by "referenced"? only via <launchable>?
  >
  >
  > In modern metainfo files yes, only via `launchable`. However, if a component `id` has a .desktop suffix, as was required in the past, and a matching .desktop file is found, that also counts as referenced and the desktop-entry file will be read.
  
  
  As developer trying to write metainfo files, I would welcome this logic also documented n the docs. The current content of the docs is confusing to me at least.
  
  >> - if there are two desktop files referenced by <launchable> where one has the ignore entry set, will this overrule the "Data will only be fetched from a desktop file if one <launchable/> tag is present" rules above?
  > 
  > No. A `launchable` tag always beats whatever was defined in the desktop-entry file itself, so if there is one launchable tag, the .desktop entry file will be taken into consideration no matter what was defined in it (to e.g. merge in category information). Any equivalent data in the metainfo file beats that of the desktop-entry file though. If there are multiple `launchable` entries, the generator has no idea which .desktop file to read, so rather than reading any and getting information wrong, it will read none (requiring the metainfo author to add all data they want in there explicitly).
  >  This could maybe be made smarter, but tbh this case is so rare that just making the metainfo files more complete in such events seems like the better approach.
  
  So, in our case here, `<launchable type="desktop-id">systemsettings.desktop</launchable>` actually means there is no need to add `X-AppStream-Ignore=true` to "kdesystemsettings.desktop" ? Because the generators would ignore it already due to a `<launchable>` present and pointing to the other desktop file?

REPOSITORY
  R124 System Settings

REVISION DETAIL
  https://phabricator.kde.org/D23306

To: ngraham, apol, mak, #plasma
Cc: kossebau, plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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