From 61a2cc3fadea9f805f572ef2ce233c12b428b871 Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Fri, 17 May 2019 08:30:59 +1000
Subject: Backport: Fixed performance bug where line end positions were reset
 withot need when switching from or to Unicode. Only noticeable on huge files.

Backport of changeset 7499:d800ba9f7006.
---
 doc/ScintillaHistory.html | 5 +++++
 src/CellBuffer.cxx        | 1 -
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/doc/ScintillaHistory.html b/doc/ScintillaHistory.html
index 6eff6c941..c1e9f5fc9 100644
--- a/doc/ScintillaHistory.html
+++ b/doc/ScintillaHistory.html
@@ -556,6 +556,11 @@
 	<li>
 	Fix bug where changing identifier sets in lexers preserved previous identifiers.
 	</li>
+	<li>
+	Fixed bug where changing to Unicode would rediscover line end positions even if still
+	sticking to ASCII (not Unicode NEL, LS, PS) line ends.
+	Only noticeable on huge files with over 100,000 lines.
+	</li>
  	<li>
 	Changed behaviour of SCI_STYLESETCASE(*,SC_CASE_CAMEL) so that it only treats 'a-zA-Z'
 	as word characters because this covers the feature's intended use (viewing case-insensitive ASCII-only
diff --git a/src/CellBuffer.cxx b/src/CellBuffer.cxx
index 37094e708..4b4a427d9 100644
--- a/src/CellBuffer.cxx
+++ b/src/CellBuffer.cxx
@@ -677,7 +677,6 @@ void CellBuffer::Allocate(Sci::Position newSize) {
 void CellBuffer::SetUTF8Substance(bool utf8Substance_) {
 	if (utf8Substance != utf8Substance_) {
 		utf8Substance = utf8Substance_;
-		ResetLineEnds();
 	}
 }
 
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