[Xcb] Initialisation of GC etc.

[Maciej Piechotka]

I have a question:
xcb_gcontext_t gc = xcb_generate_id(conn);
xcb_void_cookie_t cookie = xcb_create_gc(conn, gc, window, ...);
// 1
// Do something with gc

1. Do I have to wait/flush connection before I use gc?
2. Can I wait for confirmation of creation?
3. Can I check if it was created without blocking?

Regards
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