From 3fc21f30b4b3ce57bee74832b9185b47bc8fbe2f Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Mon, 6 Apr 2020 18:55:27 +0200
Subject: [PATCH] Invalidate brush when Opacity changes.

Fixes #2755.
---
 src/Avalonia.Visuals/Media/Brush.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Avalonia.Visuals/Media/Brush.cs b/src/Avalonia.Visuals/Media/Brush.cs
index d4894e0d14..a19d5af8b7 100644
--- a/src/Avalonia.Visuals/Media/Brush.cs
+++ b/src/Avalonia.Visuals/Media/Brush.cs
@@ -19,6 +19,11 @@ namespace Avalonia.Media
         /// <inheritdoc/>
         public event EventHandler Invalidated;
 
+        static Brush()
+        {
+            AffectsRender<Brush>(OpacityProperty);
+        }
+
         /// <summary>
         /// Gets or sets the opacity of the brush.
         /// </summary>