The initialized field was added in:
commit 82f01ad786
Author: Alex Goins <agoins@nvidia.com>
Date: Wed Apr 10 13:48:02 2019 -0500
xsync: Add resource inside of SyncCreate, export SyncCreate
But it added this field not at the end of SyncObject. It may not have
been _usefully_ possible to create those from another extension prior to
that commit, but that's still an ABI-incompatible change.
(cherry picked from commit 194ba38728)
The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.
Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.
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