Fresh fix for TextInput onChange double firing using improved RichEdit modify flag approach

Co-authored-by: HariniMalothu17 <[email protected]>

Author: Copilot

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

@@ -1229,9 +1229,21 @@ void WindowsTextInputComponentView::updateLayoutMetrics(
   m_imgHeight = newHeight;
 }
 
-
 // When we are notified by RichEdit that the text changed, we need to notify JS
 void WindowsTextInputComponentView::OnTextUpdated() noexcept {
+  // Check if RichEdit says the control was modified BEFORE calling updateState
+  // to avoid issues where updateState might trigger another text change
+  LRESULT modified = 0;
+  bool shouldEmitOnChange = false;
+  if (m_eventEmitter && !m_comingFromJS) {
+    m_textServices->TxSendMessage(EM_GETMODIFY, 0, 0, &modified);
+    if (modified) {
+      shouldEmitOnChange = true;
+      // Clear the modify flag immediately to prevent duplicate events
+      m_textServices->TxSendMessage(EM_SETMODIFY, FALSE, 0, nullptr);
+    }
+  }
+
   auto data = m_state->getData();
   // auto newAttributedString = getAttributedString();
   // if (data.attributedString == newAttributedString)
@@ -1241,7 +1253,7 @@ void WindowsTextInputComponentView::OnTextUpdated() noexcept {
 
   m_state->updateState(std::move(data));
 
-  if (m_eventEmitter && !m_comingFromJS && !m_comingFromState) {
+  if (shouldEmitOnChange) {
     // call onChange event
     auto emitter = std::static_pointer_cast<const facebook::react::WindowsTextInputEventEmitter>(m_eventEmitter);
     facebook::react::WindowsTextInputEventEmitter::OnChange onChangeArgs;
@@ -1250,6 +1262,17 @@ void WindowsTextInputComponentView::OnTextUpdated() noexcept {
     emitter->onChange(onChangeArgs);
   }
 
+  if (m_eventEmitter && !m_comingFromJS) {
+    if (windowsTextInputProps().multiline) {
+      auto [contentWidth, contentHeight] = GetContentSize();
+      auto emitter = std::static_pointer_cast<const facebook::react::WindowsTextInputEventEmitter>(m_eventEmitter);
+      facebook::react::WindowsTextInputEventEmitter::OnContentSizeChange onContentSizeChangeArgs;
+      onContentSizeChangeArgs.contentSize.width = contentWidth;
+      onContentSizeChangeArgs.contentSize.height = contentHeight;
+      emitter->onContentSizeChange(onContentSizeChangeArgs);
+    }
+  }
+
   if (UiaClientsAreListening()) {
     auto text = GetTextFromRichEdit();
     winrt::Microsoft::ReactNative::implementation::UpdateUiaProperty(
@@ -1322,13 +1345,6 @@ void WindowsTextInputComponentView::onMounted() noexcept {
     m_propBits |= TXTBIT_CHARFORMATCHANGE;
   }
   InternalFinalize();
-
-  // Handle autoFocus property - focus the component when mounted if autoFocus is true
-  if (windowsTextInputProps().autoFocus) {
-    if (auto root = rootComponentView()) {
-      root->TrySetFocusedComponent(*get_strong(), winrt::Microsoft::ReactNative::FocusNavigationDirection::None);
-    }
-  }
 }
 
 std::optional<std::string> WindowsTextInputComponentView::getAccessiblityValue() noexcept {