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4f5b52ffe7
Currently raw_read makes two passes through the list of clients. On the first pass it tries to read from the client from which it last read successfully. On the second pass it tries to read from all connected clients. Add a new pass in between these two, in which raw_read tries to read from all clients that are in the fc_input_avail case. This should be more efficient in case select was previously called and detected input available. Slightly tweak the first pass. If a client is marked as having the last successful read but reading from it now finds no input, don't unmark it unless we successfully read from a different client on one of the later passes.
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