From 03ec7a22f23f8e9697779eac29931a9eb7f2b65a Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Sun, 17 Apr 2022 10:53:34 +0200
Subject: [PATCH] Simplify spread-mode handling for the PAGE scroll-mode

The spread-mode code in `BaseViewer.#ensurePageViewVisible`-method was initially copied from the `BaseViewer._updateSpreadMode`-method, which means that it's slightly more complicated than actually necessary.
In particular, in the PAGE scroll-mode there can only be *one* spread active at a time and we thus don't need to handle insertion of multiple spread-divs.
---
 web/base_viewer.js | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/web/base_viewer.js b/web/base_viewer.js
index 3a47df701..b40eb0d1e 100644
--- a/web/base_viewer.js
+++ b/web/base_viewer.js
@@ -920,24 +920,19 @@ class BaseViewer {
       }
 
       // Finally, append the new pages to the viewer and apply the spreadMode.
-      let spread = null;
+      const spread = document.createElement("div");
+      spread.className = "spread";
+
       for (const i of pageIndexSet) {
         const pageView = this._pages[i];
         if (!pageView) {
           continue;
         }
-        if (spread === null) {
-          spread = document.createElement("div");
-          spread.className = "spread";
-          viewer.appendChild(spread);
-        } else if (i % 2 === parity) {
-          spread = spread.cloneNode(false);
-          viewer.appendChild(spread);
-        }
         spread.appendChild(pageView.div);
 
         state.pages.push(pageView);
       }
+      viewer.appendChild(spread);
     }
 
     state.scrollDown = pageNumber >= state.previousPageNumber;