[0.74] TextInput TSF support (#15364)

* Add TSF support to TextInput (#15363)

* Add TSF support to TextInput

* Change files

* fix change file

Author: acoates-ms

change/react-native-windows-055a5eb5-8f2c-409e-a4b4-4ba382eeeae0.json

@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "Add TSF support to TextInput",
+  "packageName": "react-native-windows",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

vnext/Microsoft.ReactNative/Fabric/Composition/TextInput/WindowsTextInputComponentView.cpp

@@ -1592,6 +1592,9 @@ WindowsTextInputComponentView::createVisual() noexcept {
   LRESULT res;
   winrt::check_hresult(m_textServices->TxSendMessage(EM_SETTEXTMODE, TM_PLAINTEXT, 0, &res));
 
+  // Enable TSF support
+  winrt::check_hresult(m_textServices->TxSendMessage(EM_SETEDITSTYLE, SES_USECTF, SES_USECTF, nullptr));
+
   m_caretVisual = m_compContext.CreateCaretVisual();
   visual.InsertAt(m_caretVisual.InnerVisual(), 0);
   m_caretVisual.IsVisible(false);