GNOME Shell emits a warning when "url" is absent in metadata.json,
adding it costs nothing. Links to the GIT repository because I
found no better page to reference.
Replace the GTK+ based indicator from gnome-settings-daemon with
a native one. Allows to rotate the laptop monitor and to fast open
display preferences.
Depends on bug 621017.
A new extension, originally developed by Thomas Bouffon,
allows to use classic AltTab (window based instead of app based)
in GNOME Shell.
Tested with 2.91.5
Giovanni Campagna