Add GH#1173 reference in comment.

src/cascadia/TerminalCore/Terminal.cpp

@@ -61,12 +61,12 @@ Terminal::Terminal() :
 
     _stateMachine = std::make_unique<StateMachine>(std::move(engine));
 
-    // Until we have a true pass-through mode, the decision as to whether C1
-    // controls are interpreted or not is made at the conhost level. If they
-    // are being filtered out, then we will simply never receive them. But if
-    // they are being accepted by conhost, there's a chance they may get passed
-    // through in some situations, so it's important that our state machine is
-    // always prepared to accept them.
+    // Until we have a true pass-through mode (GH#1173), the decision as to
+    // whether C1 controls are interpreted or not is made at the conhost level.
+    // If they are being filtered out, then we will simply never receive them.
+    // But if they are being accepted by conhost, there's a chance they may get
+    // passed through in some situations, so it's important that our state
+    // machine is always prepared to accept them.
     _stateMachine->SetParserMode(StateMachine::Mode::AcceptC1, true);
 
     auto passAlongInput = [&](std::deque<std::unique_ptr<IInputEvent>>& inEventsToWrite) {