From f0f09665d39a5e46422cc5ada3be0e183fe2a2b4 Mon Sep 17 00:00:00 2001
From: Chris Bracken <chris@bracken.jp>
Date: Thu, 27 Apr 2017 16:04:30 -0700
Subject: [PATCH] Clamp iOS selection to 0 < pos < length (flutter/engine#3636)

---
 .../darwin/ios/framework/Source/FlutterTextInputPlugin.mm     | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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 83c1a88f99..5624173d4e 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
@@ -169,8 +169,8 @@ static UIKeyboardType ToUIKeyboardType(NSString* inputType) {
 
   NSInteger selectionBase = [state[@"selectionBase"] intValue];
   NSInteger selectionExtent = [state[@"selectionExtent"] intValue];
-  NSUInteger start = MAX(0, MIN(selectionBase, selectionExtent));
-  NSUInteger end = MAX(0, MAX(selectionBase, selectionExtent));
+  NSUInteger start = MIN(MAX(0, MIN(selectionBase, selectionExtent)), (NSInteger)self.text.length);
+  NSUInteger end = MIN(MAX(0, MAX(selectionBase, selectionExtent)), (NSInteger)self.text.length);
   NSRange selectedRange = NSMakeRange(start, end - start);
   [self setSelectedTextRange:[FlutterTextRange rangeWithNSRange:selectedRange]
           updateEditingState:NO];