[Xcb] [Bug 99946] xcb_send_event() reads beyond end of argument / is hard to use correctly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99946

--- Comment #1 from Josh Triplett <josh at freedesktop.org> ---
Events always have exactly 32 bytes on the wire; they don't have length fields.
 I think the specification of the existing xcb_send_event assumed that all
event senders would provide 32 bytes to avoid copies.  However, I'd agree that
that makes it harder to use, and more importantly much easier to misuse.

A hypothetical xcb_send_event with a length could avoid copies by using writev
and having a fixed-size 32-byte array of padding to use as varying amounts of
as the other half.

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