From cb2fc705104022913b3eb5bdf13198463ec7eae2 Mon Sep 17 00:00:00 2001
From: mark-sil <83427558+mark-sil@users.noreply.github.com>
Date: Thu, 14 May 2026 15:29:33 -0400
Subject: [PATCH] LT-20857: Fixed a paste problem
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Fixed the paste problem when the selection is a single
paragraph. In the code a paragraph is indicated by a ‘\n’.

Note: This fix is specific to a single paragraph selection. It
does not add support for other complex selections.
---
 Src/views/VwSelection.cpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Src/views/VwSelection.cpp b/Src/views/VwSelection.cpp
index e5eb3f1c17..9db32f0ccf 100644
--- a/Src/views/VwSelection.cpp
+++ b/Src/views/VwSelection.cpp
@@ -5584,8 +5584,18 @@ STDMETHODIMP VwTextSelection::ReplaceWithTsString(ITsString * ptss)
 						qttpPara.Clear();
 
 					if (SameObject(qttpText, qttpPara))
+					{
 						qttpPara.Clear();		// Not a special paragraph property after all.
-					vpttpPara.Push(qttpPara);
+
+						// If it is not the last character, or it is the last character
+						// and we have added others, then add it to vpttpPara.
+						// Otherwise, don't add it so the new text will be treated as if
+						// it doesn't have a newline (fix for LT-20857).
+						if (ichNext < cch || vpttpPara.Size() > 0)
+							vpttpPara.Push(qttpPara);
+					}
+					else
+						vpttpPara.Push(qttpPara);
 					Assert(cNewlines == 0);
 				}
 				else