Disable WIN32IM on shutdown (#19229)

Closes #19153

## Validation Steps Performed
I tried reproducing the issue on Windows 10 and couldn't.
I'm not sure what I did wrong. But I tested it under a
debugger with VtPipeTerm and it wrote the sequences to stdout.

src/host/VtIo.cpp

@@ -230,6 +230,28 @@ bool VtIo::IsUsingVt() const
     return S_OK;
 }
 
+void VtIo::Shutdown() noexcept
+{
+    if (_state != State::Running)
+    {
+        return;
+    }
+
+    // The reverse of what we did in StartIfNeeded.
+    try
+    {
+        Writer writer{ this };
+
+        writer.WriteUTF8(
+            "\x1b[?1004l" // Focus Event Mode
+            "\x1b[?9001l" // Win32 Input Mode
+        );
+
+        writer.Submit();
+    }
+    CATCH_LOG();
+}
+
 void VtIo::RequestCursorPositionFromTerminal()
 {
     if (_lookingForCursorPosition)

src/host/VtIo.hpp

@@ -57,9 +57,9 @@ namespace Microsoft::Console::VirtualTerminal
         static wchar_t SanitizeUCS2(wchar_t ch);
 
         [[nodiscard]] HRESULT Initialize(const ConsoleArguments* const pArgs);
-
         bool IsUsingVt() const;
         [[nodiscard]] HRESULT StartIfNeeded();
+        void Shutdown() noexcept;
 
         void RequestCursorPositionFromTerminal();
         void SetDeviceAttributes(til::enumset<DeviceAttribute, uint64_t> attributes) noexcept;

src/interactivity/base/ServiceLocator.cpp

@@ -67,13 +67,11 @@ void ServiceLocator::RundownAndExit(const HRESULT hr)
         Sleep(INFINITE);
     }
 
-    // MSFT:40226902 - HOTFIX shutdown on OneCore, by leaking the renderer, thereby
-    // reducing the change for existing race conditions to turn into deadlocks.
-#ifndef NDEBUG
     // By locking the console, we ensure no background tasks are accessing the
     // classes we're going to destruct down below (for instance: CursorBlinker).
     s_globals.getConsoleInformation().LockConsole();
-#endif
+
+    gci.GetVtIo()->Shutdown();
 
     // A History Lesson from MSFT: 13576341:
     // We introduced RundownAndExit to give services that hold onto important handles
@@ -92,13 +90,6 @@ void ServiceLocator::RundownAndExit(const HRESULT hr)
 
     // TODO: MSFT: 14397093 - Expand graceful rundown beyond just the Hot Bug input services case.
 
-    // MSFT:40226902 - HOTFIX shutdown on OneCore, by leaking the renderer, thereby
-    // reducing the change for existing race conditions to turn into deadlocks.
-#ifndef NDEBUG
-    delete s_globals.pRender;
-    s_globals.pRender = nullptr;
-#endif
-
     if (s_oneCoreTeardownFunction)
     {
         s_oneCoreTeardownFunction();
@@ -107,6 +98,9 @@ void ServiceLocator::RundownAndExit(const HRESULT hr)
     // MSFT:40226902 - HOTFIX shutdown on OneCore, by leaking the renderer, thereby
     // reducing the change for existing race conditions to turn into deadlocks.
 #ifndef NDEBUG
+    delete s_globals.pRender;
+    s_globals.pRender = nullptr;
+
     s_consoleWindow.reset(nullptr);
 #endif
 

src/tools/vtpipeterm/main.cpp

@@ -89,7 +89,7 @@ static int run(int argc, const wchar_t* argv[])
     auto viewportSize = getViewportSize();
 
     HPCON hPC = nullptr;
-    THROW_IF_FAILED(ConptyCreatePseudoConsole(viewportSize, pipe.client.get(), pipe.client.get(), 0, &hPC));
+    THROW_IF_FAILED(ConptyCreatePseudoConsole(viewportSize, pipe.client.get(), pipe.client.get(), PSEUDOCONSOLE_INHERIT_CURSOR, &hPC));
     pipe.client.reset();
 
     PROCESS_INFORMATION pi;