From ffe1d3fca6199594535967cf9c05fb4a7ee7cc27 Mon Sep 17 00:00:00 2001
From: Gary Qian <garyq@google.com>
Date: Fri, 22 Nov 2019 14:02:50 -0800
Subject: [PATCH] Do not default to downstream affinity on iOS insertText
 (flutter/engine#13852)

---
 .../darwin/ios/framework/Source/FlutterTextInputPlugin.mm     | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.mm b/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.mm
index ad39e710eeb..f22fb51b42d 100644
--- a/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.mm
+++ b/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterTextInputPlugin.mm
@@ -621,7 +621,9 @@ static UIReturnKeyType ToUIReturnKeyType(NSString* inputType) {
 }
 
 - (void)insertText:(NSString*)text {
-  _selectionAffinity = _kTextAffinityDownstream;
+  // The affinity is unknown here. Set to "" so that Flutter interprets it
+  // as ambiguous and uses a fallback affinity.
+  _selectionAffinity = "";
   [self replaceRange:_selectedTextRange withText:text];
 }