From 412502370d2efee794d934524ade39a1ddfe79c8 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Thu, 30 Nov 2023 20:29:40 +0100
Subject: [PATCH] Remove the "transitionend" event listener from the default
 viewer (issue 17347)

Given that this event listener is only used to trigger rendering after the sidebar has been opened/closed, we can utilize the existing one in the `PDFSidebar` class for this purpose instead. That one is registered on the sidebar DOM-element, and is needed to remove a CSS-class indicating that the sidebar is moving.
---
 web/app.js         | 10 ----------
 web/pdf_sidebar.js |  2 ++
 2 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/web/app.js b/web/app.js
index 253a6d78f..3bb2eb6e1 100644
--- a/web/app.js
+++ b/web/app.js
@@ -689,16 +689,6 @@ const PDFViewerApplication = {
       appConfig.toolbar?.viewFind?.classList.add("hidden");
     }
 
-    appConfig.mainContainer.addEventListener(
-      "transitionend",
-      function (evt) {
-        if (evt.target === /* mainContainer */ this) {
-          eventBus.dispatch("resize", { source: this });
-        }
-      },
-      true
-    );
-
     if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
       if (file) {
         this.open({ url: file });
diff --git a/web/pdf_sidebar.js b/web/pdf_sidebar.js
index 394c4e322..50e319de7 100644
--- a/web/pdf_sidebar.js
+++ b/web/pdf_sidebar.js
@@ -329,6 +329,8 @@ class PDFSidebar {
     this.sidebarContainer.addEventListener("transitionend", evt => {
       if (evt.target === this.sidebarContainer) {
         this.outerContainer.classList.remove("sidebarMoving");
+        // Ensure that rendering is triggered after opening/closing the sidebar.
+        this.eventBus.dispatch("resize", { source: this });
       }
     });