GNOME Software doesn't support installation of flatpak with multiple apps

Submitted by Sesivany @Sesivany

Assigned to Richard Hughes @hughsie

Link to original bug (#771767)

Description

GNOME Software can newly install .flatpak files, but it fails if the flatpak bundle includes multiple apps. LibreOffice flatpak is a good example, it's one file, but includes Writer, Calc, Impress, Base, Math: http://www.libreoffice.org/download/flatpak/

GNOME Software fails to handle the bundle and install the apps:

13:06:45:0025 PK  notify::connected
13:06:45:0025 Gs  acquired session service
13:06:45:0058 Gs  autogenerating unique-id for org.libreoffice.LibreOffice.desktop
13:06:45:0059 Gs  org.libreoffice.LibreOffice.desktop non-transient state now local
13:06:45:0059 Gs  runtime for org.libreoffice.LibreOffice is org.gnome.Platform/x86_64/3.20
13:06:45:0059 Gs  autogenerating unique-id for org.gnome.Platform.runtime
13:06:45:0060 As  run 0x558ad47e6d90~AsStore:store-from-root
13:06:45:0060 As  using icon path (null)
13:06:45:0061 As  run 0x558ad47e6d90~AsStore:match-addons
13:06:45:0061 As  Emitting ::changed() [from-root]
13:06:45:0061 Gs  5 applications found in AppStream data
13:06:45:0061 Gs  failed to call gs_plugin_file_to_app on flatpak-system: application org.libreoffice.LibreOffice.desktop not found
13:06:45:0069 Gs  using main window
13:06:45:0075 Gs  failed to convert to GsApp: no application was created for /home/mkasik/Downloads/LibreOffice.flatpak
13:06:45:0107 Gs  emitting global finished
13:06:46:0530 Gs  modal dialog 0x558ad7f482f0 unmapped

It also shows a very generic error message: This did not work. The file is not supported.