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Don't honour single read per client isc_nm_read() call in the TLSDNS

Ondřej Surý requested to merge 3772-revert-fix-single-read-tlsdns-client-v9_18 into v9_18

This reverts commit f17f5e83 that made following change:

The TLSDNS transport was not honouring the single read callback for TLSDNS client. It would call the read callbacks repeatedly in case the single TLS read would result in multiple DNS messages in the decoded buffer.

Turns out that this change broke XoT, so we are reverting the change until we figure out a proper fix that will keep the design promise and not break XoT at the same time.

See #3772 (closed)

Edited by Michał Kępień

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