From 8f71c00440df8a76367325d75c05e541f2b048cd Mon Sep 17 00:00:00 2001
From: Benoit Pierre <benoit.pierre@gmail.com>
Date: Sat, 17 May 2025 09:25:46 +0200
Subject: [PATCH] ImageViewer: small optimization (#13807)

Avoid decoding the first image twice (and decompressing it twice when used through ArchiveViewer).
---
 frontend/ui/widget/imageviewer.lua | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/frontend/ui/widget/imageviewer.lua b/frontend/ui/widget/imageviewer.lua
index 6ddcba711..436ed1fd3 100644
--- a/frontend/ui/widget/imageviewer.lua
+++ b/frontend/ui/widget/imageviewer.lua
@@ -466,6 +466,9 @@ function ImageViewer:onShow()
 end
 
 function ImageViewer:switchToImageNum(image_num)
+    if image_num == self._images_list_cur then
+        return
+    end
     if self.image and self.image_disposable and self.image.free then
         logger.dbg("ImageViewer:switchToImageNum: free self.image", self.image)
         self.image:free()