ENH Remove animation for thumbnails by default.

code/Model/ThumbnailGenerator.php

@@ -7,6 +7,7 @@
 use SilverStripe\Assets\Storage\AssetContainer;
 use SilverStripe\Assets\Storage\AssetStore;
 use SilverStripe\Assets\Storage\DBFile;
+use SilverStripe\Core\ClassInfo;
 use SilverStripe\Core\Config\Configurable;
 
 /**
@@ -65,6 +66,8 @@ class ThumbnailGenerator
      */
     private static $method = 'FitMax';
 
+    private bool $allowsAnimation = false;
+
     /**
      * Generate thumbnail and return the "src" property for this thumbnail
      *
@@ -107,6 +110,14 @@ public function generateThumbnail(AssetContainer $file, $width, $height)
             $file = $file->existingOnly();
         }
 
+        // Try to remove the animation if we can
+        if (!$this->getAllowsAnimation() && $file->getIsAnimated() && ClassInfo::hasMethod($file, 'RemoveAnimation')) {
+            $noAnimation = $file->RemoveAnimation();
+            if ($noAnimation) {
+                $file = $noAnimation;
+            }
+        }
+
         // Make large thumbnail
         $method = $this->config()->get('method');
         return $file->$method($width, $height);
@@ -173,4 +184,15 @@ public function setGenerates($generates)
         $this->generates = $generates;
         return $this;
     }
+
+    public function getAllowsAnimation(): bool
+    {
+        return $this->allowsAnimation;
+    }
+
+    public function setAllowsAnimation(bool $allows): static
+    {
+        $this->allowsAnimation = $allows;
+        return $this;
+    }
 }