`virtual_stream_relay` now muxes the AU source by input desktop. A DesktopWatcher
(SYSTEM-only Winlogon-name poll) drives it: the user-session WGC helper relay
feeds the normal (Default) desktop; the host's OWN DDA capturer+encoder — opened
lazily on the first secure transition, on the same SudoVDA target with a no-op
keepalive (the host still holds the real isolation owner) — captures the secure
(Winlogon: UAC/lock/login) desktop that WGC can't see. Every switch latches
"wait for IDR" and forces the now-active source to emit a keyframe (the two
encoders keep independent infinite-GOP state, so the client must resume on an
IDR); returning to the helper also drains its stale buffered AUs first.
Reconfigure drops the stale-target DDA; keyframe requests route to the live
source. Send path (FEC/seal/paced-send) unchanged.
Also: wgc_relay gains try_recv (drain on switch-back); open_dda takes dims as
args (avoids a closure borrow of the reassigned cur_mode); the forward! macro
returns bool with `break 'outer` at the call site (no in-macro label hygiene).
cfg-gated windows-only. Live validation (UAC switch over a session) pending.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
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