Invalidate brush when Opacity changes.

Fixes #2755.
6 years ago · 3fc21f30b4
1 changed files with 5 additions and 0 deletions
--- 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>