This really looks like a leftover from b861aad8e2.
In any case, if that function shall become part of extension/driver API,
it should be declared with _X_EXPORT in some suitable header file - locally
declaring extern really isn't a good idea and just an invitation for subtle bugs.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1265>
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(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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