From 1b2e98f3ce06f43fc211fe688fc068e61b109bb9 Mon Sep 17 00:00:00 2001
From: Calixte Denizet <calixte.denizet@gmail.com>
Date: Tue, 7 Apr 2026 15:48:23 +0200
Subject: [PATCH] Make sure the thumbnails positions are recomputed after a
 structural change but after a reflow has been done (bug 2028193)

---
 web/pdf_thumbnail_viewer.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/web/pdf_thumbnail_viewer.js b/web/pdf_thumbnail_viewer.js
index cf62bcdf0..46c146999 100644
--- a/web/pdf_thumbnail_viewer.js
+++ b/web/pdf_thumbnail_viewer.js
@@ -707,7 +707,7 @@ class PDFThumbnailViewer {
       pagesMapper.movePages(selectedPages, pagesToMove, newIndex);
 
       this.#updateCurrentPage(this.#updateThumbnails(currentPageNumber));
-      this.#computeThumbnailsPosition();
+      this.#thumbnailsPositions = null;
 
       selectedPages.clear();
       this.#pageNumberToRemove = NaN;
@@ -920,7 +920,7 @@ class PDFThumbnailViewer {
     pagesMapper.pastePages(index);
     this.#updateThumbnails(currentPageNumber);
     this.#updateCurrentPage(index + 1, /* forceFocus = */ true);
-    this.#computeThumbnailsPosition();
+    this.#thumbnailsPositions = null;
 
     this.eventBus.dispatch("pagesedited", {
       source: this,
@@ -956,6 +956,8 @@ class PDFThumbnailViewer {
 
     pagesMapper.deletePages(pagesToDelete);
     this.#updateCurrentPage(this.#updateThumbnails(currentPageNumber));
+    this.#thumbnailsPositions = null;
+
     selectedPages.clear();
     this.#updateMenuEntries();