[RFC] DeepColor Visual Class Extension

[Jacob Lifshay]

>
> If we left them out of the connection setup block and relied on a separate
> request to get a list of DeepColor visuals it would alleviate that issue, but
> then we run into the same issue Aaron pointed out with XGetWindowAttributes.
> Non-HDR clients would get what appears to be a bogus visual when querying the
> visual of an HDR window because xlib would be unaware of it.
>
> If you keep track of whether clients support HDR per-connection, you could
fake the HDR windows' visual id for the non-HDR clients, returning a
TrueColor visual id instead. This will avoid the problem of the client
thinking that the visual id is bogus.

Jacob Lifshay
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