From 58e1396c15bc0eb3e628f8324e27f2f258fa82dd Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Fri, 4 Oct 2024 22:39:10 +0200
Subject: [PATCH] Fix rich text box snapping to be ignored at text end

#2964
---
 Source/Engine/UI/GUI/Common/RichTextBoxBase.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Source/Engine/UI/GUI/Common/RichTextBoxBase.cs b/Source/Engine/UI/GUI/Common/RichTextBoxBase.cs
index 17dc25e16..4a49f5bad 100644
--- a/Source/Engine/UI/GUI/Common/RichTextBoxBase.cs
+++ b/Source/Engine/UI/GUI/Common/RichTextBoxBase.cs
@@ -280,11 +280,16 @@ namespace FlaxEngine.GUI
                 GetNearestTextBlock(end, out TextBlock endTextBlock, !movingBack);
 
                 snappedStart = startTextBlock.Range.Contains(start) ? start : (movingBack ? startTextBlock.Range.EndIndex - 1 : startTextBlock.Range.StartIndex);
-
                 snappedEnd = endTextBlock.Range.Contains(end) ? end : (movingBack ? endTextBlock.Range.EndIndex - 1 : endTextBlock.Range.StartIndex);
 
                 snappedStart = movingBack ? Math.Min(start, snappedStart) : Math.Max(start, snappedStart);
                 snappedEnd = movingBack ? Math.Min(end, snappedEnd) : Math.Max(end, snappedEnd);
+
+                // Don't snap if selection is right in the end of the text
+                if (start == _text.Length)
+                    snappedStart = _text.Length;
+                if (end == _text.Length)
+                    snappedEnd = _text.Length;
             }
 
             base.SetSelection(snappedStart, snappedEnd, withScroll);