Fix P2P text chat timeout on WebRTC regions and delay voice renegotiation on disconnect (#5706)

* Fix P2P text chat timeout on WebRTC regions and delay voice renegotiation on disconnect

Text chat: On WebRTC regions, getOutgoingCallInterface() returns nullptr,
causing mP2PAsAdhocCall to be true for all P2P sessions including text-only
IMs. This routed text chat through startP2PVoiceCoro which sent a "start p2p
voice" request and waited for a server reply that never came, resulting in a
30-second session initialization timeout. Fix by gating the p2p-as-adhoc
server init on mStartedAsIMCall so text-only sessions initialize immediately.

WebRTC: Split kFailed and kDisconnected handling in OnConnectionChange.
kFailed still renegotiates immediately. kDisconnected now waits 10 seconds
before renegotiating, giving the connection time to recover on its own. Uses
a sequence counter to ensure only the most recent disconnect transition can
trigger renegotiation, preventing stale delayed tasks from firing early
after disconnect/reconnect cycles.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Revert im-change for not using the voice subsystem when doing a text-only IM

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2 files changed, 38 insertions, 2 deletions

diff --git a/indra/llwebrtc/llwebrtc.cpp b/indra/llwebrtc/llwebrtc.cpp
index 6bf38cc1f6..a286f75f42 100644
--- a/indra/llwebrtc/llwebrtc.cpp
+++ b/indra/llwebrtc/llwebrtc.cpp
@@ -811,6 +811,8 @@ LLWebRTCPeerConnectionImpl::LLWebRTCPeerConnectionImpl() :
     mPeerConnection(nullptr),
     mMute(MUTE_INITIAL),
     mAnswerReceived(false),
+    mPeerConnectionState(webrtc::PeerConnectionInterface::PeerConnectionState::kNew),
+    mDisconnectCount(0),
     mPendingJobs(0)
 {
 }
@@ -1237,11 +1239,15 @@ void LLWebRTCPeerConnectionImpl::OnIceGatheringChange(webrtc::PeerConnectionInte
     }
 }
 
+static const webrtc::TimeDelta DISCONNECT_RENEGOTIATE_DELAY = webrtc::TimeDelta::Millis(10000);
+
 // Called any time the PeerConnectionState changes.
 void LLWebRTCPeerConnectionImpl::OnConnectionChange(webrtc::PeerConnectionInterface::PeerConnectionState new_state)
 {
     RTC_LOG(LS_ERROR) << __FUNCTION__ << " Peer Connection State Change " << new_state;
 
+    mPeerConnectionState = new_state;
+
     switch (new_state)
     {
         case webrtc::PeerConnectionInterface::PeerConnectionState::kConnected:
@@ -1257,13 +1263,32 @@ void LLWebRTCPeerConnectionImpl::OnConnectionChange(webrtc::PeerConnectionInterf
             break;
         }
         case webrtc::PeerConnectionInterface::PeerConnectionState::kFailed:
-        case webrtc::PeerConnectionInterface::PeerConnectionState::kDisconnected:
         {
             for (auto &observer : mSignalingObserverList)
             {
                 observer->OnRenegotiationNeeded();
             }
-
+            break;
+        }
+        case webrtc::PeerConnectionInterface::PeerConnectionState::kDisconnected:
+        {
+            // Wait 10 seconds before renegotiating in case the connection recovers on its own.
+            // Use a sequence count so that only the most recent disconnect transition can trigger
+            // a renegotiation, avoiding stale delayed tasks from earlier disconnect/reconnect cycles.
+            uint32_t disconnect_count = ++mDisconnectCount;
+            mWebRTCImpl->PostDelayedSignalingTask(
+                [this, disconnect_count]()
+                {
+                    if (disconnect_count == mDisconnectCount
+                        && mPeerConnectionState == webrtc::PeerConnectionInterface::PeerConnectionState::kDisconnected)
+                    {
+                        for (auto &observer : mSignalingObserverList)
+                        {
+                            observer->OnRenegotiationNeeded();
+                        }
+                    }
+                },
+                DISCONNECT_RENEGOTIATE_DELAY);
             break;
         }
         default:
diff --git a/indra/llwebrtc/llwebrtc_impl.h b/indra/llwebrtc/llwebrtc_impl.h
index 2ff85c92ee..bd7a2e0bcf 100644
--- a/indra/llwebrtc/llwebrtc_impl.h
+++ b/indra/llwebrtc/llwebrtc_impl.h
@@ -480,6 +480,13 @@ class LLWebRTCImpl : public LLWebRTCDeviceInterface, public webrtc::AudioDeviceO
         mSignalingThread->PostTask(std::move(task), location);
     }
 
+    void PostDelayedSignalingTask(absl::AnyInvocable<void() &&> task,
+                  webrtc::TimeDelta delay,
+                  const webrtc::Location& location = webrtc::Location::Current())
+    {
+        mSignalingThread->PostDelayedTask(std::move(task), delay, location);
+    }
+
     void PostNetworkTask(absl::AnyInvocable<void() &&> task,
                   const webrtc::Location& location = webrtc::Location::Current())
     {
@@ -676,6 +683,10 @@ class LLWebRTCPeerConnectionImpl : public LLWebRTCPeerConnectionInterface,
     std::vector<LLWebRTCDataObserver *> mDataObserverList;
     webrtc::scoped_refptr<webrtc::DataChannelInterface> mDataChannel;
 
+    // connection state tracking for delayed renegotiation on disconnect
+    webrtc::PeerConnectionInterface::PeerConnectionState mPeerConnectionState;
+    uint32_t mDisconnectCount;
+
     std::atomic<int> mPendingJobs;
 };