From dc322d49dc88f1dfd863e924c01ead480c1364f5 Mon Sep 17 00:00:00 2001
From: Harald Kuhr <harald.kuhr@gmail.com>
Date: Mon, 5 Jun 2023 12:36:38 +0200
Subject: [PATCH] #722 Fix WebP animation transparent frame issue

(cherry picked from commit ba1f7546113bdb16600b6662141110957d69d152)
---
 .../com/twelvemonkeys/imageio/plugins/webp/WebPImageReader.java  | 1 +
 1 file changed, 1 insertion(+)

diff --git a/imageio/imageio-webp/src/main/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReader.java b/imageio/imageio-webp/src/main/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReader.java
index 5767ef8f..5570f71c 100644
--- a/imageio/imageio-webp/src/main/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReader.java
+++ b/imageio/imageio-webp/src/main/java/com/twelvemonkeys/imageio/plugins/webp/WebPImageReader.java
@@ -480,6 +480,7 @@ final class WebPImageReader extends ImageReaderBase {
 
             switch (nextChunk) {
                 case WebP.CHUNK_ALPH:
+                    seenALPH = true;
                     readAlpha(destination, param, width, height);
                     break;