Make conpty request win32-input-mode on startup

src/host/VtIo.cpp

@@ -237,6 +237,8 @@ bool VtIo::IsUsingVt() const
         CATCH_RETURN();
     }
 
+    LOG_IF_FAILED(_pVtRenderEngine->RequestWin32Input());
+
     // MSFT: 15813316
     // If the terminal application wants us to inherit the cursor position,
     //  we're going to emit a VT sequence to ask for the cursor position, then

src/renderer/vt/VtSequences.cpp

@@ -436,3 +436,14 @@ using namespace Microsoft::Console::Render;
 {
     return _Write("\x1b[29m");
 }
+
+// Method Description:
+// - TODO
+// Arguments:
+// - <none>
+// Return Value:
+// - S_OK if we succeeded, else an appropriate HRESULT for failing to allocate or write.
+[[nodiscard]] HRESULT VtEngine::_RequestWin32Input() noexcept
+{
+    return _Write("\x1b]1000;1;1\x07");
+}

src/renderer/vt/state.cpp

@@ -509,3 +509,16 @@ void VtEngine::SetResizeQuirk(const bool resizeQuirk)
 {
     return S_OK;
 }
+
+// Method Description:
+// - TODO
+// Arguments:
+// - <none>
+// Return Value:
+// - S_OK if we succeeded, else an appropriate HRESULT for failing to allocate or write.
+HRESULT VtEngine::RequestWin32Input() noexcept
+{
+    RETURN_IF_FAILED(_RequestWin32Input());
+    RETURN_IF_FAILED(_Flush());
+    return S_OK;
+}

src/renderer/vt/vtrenderer.hpp

@@ -110,6 +110,8 @@ namespace Microsoft::Console::Render
 
         [[nodiscard]] virtual HRESULT ManuallyClearScrollback() noexcept;
 
+        [[nodiscard]] HRESULT RequestWin32Input() noexcept;
+
     protected:
         wil::unique_hfile _hFile;
         std::string _buffer;
@@ -208,6 +210,8 @@ namespace Microsoft::Console::Render
 
         [[nodiscard]] HRESULT _RequestCursor() noexcept;
 
+        [[nodiscard]] HRESULT _RequestWin32Input() noexcept;
+
         [[nodiscard]] virtual HRESULT _MoveCursor(const COORD coord) noexcept = 0;
         [[nodiscard]] HRESULT _RgbUpdateDrawingBrushes(const COLORREF colorForeground,
                                                        const COLORREF colorBackground,