From a8d8732c51b3f6bcdc52a093aa0b987a120ad9fe Mon Sep 17 00:00:00 2001
From: oehhar <harald.oehlmann@elmicron.de>
Date: Thu, 9 Jun 2022 13:06:29 +0000
Subject: GIF read: honor that "Plain Text Extension" limits the scope of a
 "Graphic Control Extension", reset saved information

---
 generic/tkImgGIF.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/generic/tkImgGIF.c b/generic/tkImgGIF.c
index 594ec1e..f0ac047 100644
--- a/generic/tkImgGIF.c
+++ b/generic/tkImgGIF.c
@@ -1067,7 +1067,12 @@ DoExtension(
 
     switch (label) {
     case 0x01:			/* Plain Text Extension */
-        /* this extension is ignored, skip below */
+	/*
+	 * This extension starts a new scope, so Graphic control Extension
+	 * data should be cleared
+	 */
+	*transparent = -1;
+	/* this extension is ignored, skip below */
 	break;
     case 0xf9:			/* Graphic Control Extension */
 	count = GetDataBlock(gifConfPtr, chan, buf);
-- 
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