From 1d3381851bb6d0283055c19052a95eb48c4e4ac2 Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Wed, 22 Apr 2026 09:07:06 +1000
Subject: Assert that string is being inserted inside the document range. This
 would be caught in SplitVector::InsertFromArray but this simplifies the
 failure and avoids potential for modifications.

---
 src/Document.cxx | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src')

diff --git a/src/Document.cxx b/src/Document.cxx
index 8e9c7d8c4..f3dac9aaa 100644
--- a/src/Document.cxx
+++ b/src/Document.cxx
@@ -1485,6 +1485,7 @@ Sci::Position Document::InsertString(Sci::Position position, const char *s, Sci:
 	if (insertLength <= 0) {
 		return 0;
 	}
+	PLATFORM_ASSERT((position >= 0) && (position <= Length()));
 	CheckReadOnly();	// Application may change read only state here
 	if (cb.IsReadOnly()) {
 		return 0;
-- 
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