From e9ca6f82bca488d5d0866ece17df07b260b14d42 Mon Sep 17 00:00:00 2001
From: alyosha-tas <alexei.f.k@gmail.com>
Date: Fri, 5 Jul 2019 10:06:00 -0400
Subject: [PATCH] Trace Logger: Fix exception when scrolling

---
 BizHawk.Client.EmuHawk/tools/TraceLogger.cs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/BizHawk.Client.EmuHawk/tools/TraceLogger.cs b/BizHawk.Client.EmuHawk/tools/TraceLogger.cs
index 5516f31055..d2690cf4cd 100644
--- a/BizHawk.Client.EmuHawk/tools/TraceLogger.cs
+++ b/BizHawk.Client.EmuHawk/tools/TraceLogger.cs
@@ -133,7 +133,11 @@ namespace BizHawk.Client.EmuHawk
 			{
 				if (ToWindowRadio.Checked)
 				{
-					TraceView.VirtualListSize = _instructions.Count;
+					// setting to zero first fixes an exception when scrolling the view
+					// how or why I don't know
+					// it's hidden behind an internal class ListViewNativeItemCollection
+					TraceView.VirtualListSize = 0;
+					TraceView.VirtualListSize = _instructions.Count;		
 				}
 				else
 				{
@@ -148,7 +152,7 @@ namespace BizHawk.Client.EmuHawk
 					//connect tracer to sink for next frame
 					if (ToWindowRadio.Checked)
 					{
-						//update listview with most recentr results
+						//update listview with most recent results
 						TraceView.BlazingFast = !GlobalWin.MainForm.EmulatorPaused;
 
 						Tracer.Sink = new CallbackSink()