Instead of sending while serializing (what even was that), we serialize the whole packet into a buffer which can be sent in one go. First of all this reduces the number of sends by a lot. This also fixes WindowServer ending up sending partial packets when client is not responsive. Previously we would just try sending once, if any send failed the send was aborted while partial packet was already transmitted. This lead to packet stream being out of sync leading to the client killing itself. Now we allow 64 KiB outgoing buffer per client. If this buffer ever fills up, we will not send partial packets.
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3.0 KiB