From 7d39dfc7c30e899c54ac309df5c9fe8ebe6d9127 Mon Sep 17 00:00:00 2001
From: James Jackson-South <james_south@hotmail.com>
Date: Tue, 11 Jan 2022 16:50:40 +1100
Subject: [PATCH] NET472 doesn't have Clear.

---
 src/ImageSharp/Formats/ImageFormatManager.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/ImageSharp/Formats/ImageFormatManager.cs b/src/ImageSharp/Formats/ImageFormatManager.cs
index d927b87d13..f3fde403da 100644
--- a/src/ImageSharp/Formats/ImageFormatManager.cs
+++ b/src/ImageSharp/Formats/ImageFormatManager.cs
@@ -37,7 +37,7 @@ namespace SixLabors.ImageSharp.Formats
         /// <summary>
         /// The list of supported <see cref="IImageFormatDetector"/>s.
         /// </summary>
-        private readonly ConcurrentBag<IImageFormatDetector> imageFormatDetectors = new();
+        private ConcurrentBag<IImageFormatDetector> imageFormatDetectors = new();
 
         /// <summary>
         /// Initializes a new instance of the <see cref="ImageFormatManager" /> class.
@@ -144,7 +144,7 @@ namespace SixLabors.ImageSharp.Formats
         /// <summary>
         /// Removes all the registered image format detectors.
         /// </summary>
-        public void ClearImageFormatDetectors() => this.imageFormatDetectors.Clear();
+        public void ClearImageFormatDetectors() => this.imageFormatDetectors = new();
 
         /// <summary>
         /// Adds a new detector for detecting mime types.