MetaSelectionSourceMemory currently uses GBytes for its underlying data.
This can cause memory overhead when large items, such as HD images, are
stored in the clipboard. This commit changes the underlying data
structure to a MetaAnonymousFile object, which writes to memfd instead
of heap. When reading, MetaSelectionSourceMemory will create a
Gio.UnixInputStream from the file descriptor generated by
MetaAnonymousFile. We subclass the UnixInputStream as
MetaUnixInputStream, to override the stream's close_fn function so
that it invokes meta_anonymous_file_close_fd when the stream terminates.
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3551>
Dropped obsolete Free Software Foundation address pointing
to the FSF website instead as suggested by
https://www.gnu.org/licenses/gpl-howto.html
keeping intact the important part of the historical notice
as requested by the license.
Resolving rpmlint reported issue E: incorrect-fsf-address.
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3155>
