From b6bd196bc22024f3404104003952c5f88bcd828c Mon Sep 17 00:00:00 2001
From: Jaifroid <egk10@cam.ac.uk>
Date: Mon, 14 Jun 2021 15:38:21 +0100
Subject: [PATCH] Improve composition for non-MS browsers

Former-commit-id: a8637b15af7ae2132c7712b4b20e70815d91e559 [formerly a1271a15007ff9482e5ddaacfe9d0d79ae6de0e7 [formerly fe38645eaccfe182c8796d8e50ed2c370ef1c0fd]]
Former-commit-id: ffb204447e52cde9485deb2ca98c527405b050a2
Former-commit-id: 59ed13ac7dc0a3e40b8a20368ce0480457bfb481
---
 package.json  |  4 +---
 www/js/app.js | 12 +++++++++---
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/package.json b/package.json
index 1c5f95b9..a73b7c6b 100644
--- a/package.json
+++ b/package.json
@@ -88,6 +88,4 @@
   "dependencies": {
     "@types/fs-extra": "^9.0.11"
   }
-}
-
-
+}
diff --git a/www/js/app.js b/www/js/app.js
index 71e43e21..18d85cff 100644
--- a/www/js/app.js
+++ b/www/js/app.js
@@ -3826,12 +3826,18 @@ define(['jquery', 'zimArchiveLoader', 'uiUtil', 'util', 'cache', 'images', 'sett
                     // Make sure the article area is displayed
                     setTab();
                     checkToolbar();
-                    // setTimeout(function() {
+                    var showArticle = function () {
                         articleDocument.bgcolor = "";
                         articleDocument.hidden = false;
                         articleWindow.document.body.hidden = false;
-                    // }, 0);
-                    
+                    };
+                    if ('MSBlobBuilder' in window) {
+                        // For legacy MS browsers, including UWP, delay causes blank screen on slow systems
+                        showArticle();
+                    } else {
+                        // For Chromium browsers a small delay greatly improves composition
+                        setTimeout(showArticle, 80);
+                    }
                 };
 
                 // For articles loaded in the iframe, we need to set the articleWindow (but if the user is opening a new tab/window,