From d7bbd9d248e871a57212a025e1adbc5ba42a52ae Mon Sep 17 00:00:00 2001
From: Daniel <dpenalba@codicesoftware.com>
Date: Tue, 25 Oct 2022 18:25:50 +0200
Subject: [PATCH] When the control is not effectively visible the matrix could
 be null

---
 src/AvaloniaEdit/Utils/ExtensionMethods.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/AvaloniaEdit/Utils/ExtensionMethods.cs b/src/AvaloniaEdit/Utils/ExtensionMethods.cs
index 7fe4b896..fd5b0900 100644
--- a/src/AvaloniaEdit/Utils/ExtensionMethods.cs
+++ b/src/AvaloniaEdit/Utils/ExtensionMethods.cs
@@ -224,6 +224,9 @@ public static Point SnapToDevicePixels(this Point p, IVisual targetVisual)
             // Create a matrix to translate from control coordinates to device coordinates.
             var m = targetVisual.TransformToVisual((Control)root) * Matrix.CreateScale(scaling);
 
+            if (m == null)
+                return p;
+
             // Translate the point to device coordinates.
             var devicePoint = p.Transform(m.Value);