From 275772818ddc6b03cee4b72435828dca01b291e8 Mon Sep 17 00:00:00 2001
From: Sergey Minakov <naithar@icloud.com>
Date: Fri, 30 Apr 2021 11:40:12 +0300
Subject: [iOS] Nonnegative start index for virtual keyboard range

---
 platform/iphone/keyboard_input_view.mm | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'platform/iphone')

diff --git a/platform/iphone/keyboard_input_view.mm b/platform/iphone/keyboard_input_view.mm
index 1408f78e90..0e5a98a3e6 100644
--- a/platform/iphone/keyboard_input_view.mm
+++ b/platform/iphone/keyboard_input_view.mm
@@ -88,13 +88,15 @@
 	self.text = existingString;
 	self.previousText = existingString;
 
+	NSInteger safeStartIndex = MAX(start, 0);
+
 	NSRange textRange;
 
 	// Either a simple cursor or a selection.
 	if (end > 0) {
-		textRange = NSMakeRange(start, end - start);
+		textRange = NSMakeRange(safeStartIndex, end - start);
 	} else {
-		textRange = NSMakeRange(start, 0);
+		textRange = NSMakeRange(safeStartIndex, 0);
 	}
 
 	self.selectedRange = textRange;
-- 
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