[Xcb] xcb_clear_area

[Peter Harris]

Matthew Allen wrote:
> I needed an xcb_flush after the xcb_clear_area to get the EXPOSE events.
> 
> I'm still not sure which things need an xcb_flush and which don't.

It's very simple: Everything needs an xcb_flush.

The only exception is *_reply() (and xcb_request_check), which will call
xcb_flush for you if necessary to receive the reply.

Peter Harris
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