From 2c68dc443ad5ca6b2a83814208a996fc11b84f6e Mon Sep 17 00:00:00 2001
From: yflory <yann.flory@xwiki.com>
Date: Fri, 11 Dec 2020 15:49:29 +0100
Subject: [PATCH 1/2] Fix scrambled data in spreadsheets: disable 'undo'

---
 www/common/onlyoffice/inner.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/www/common/onlyoffice/inner.js b/www/common/onlyoffice/inner.js
index 881db3d06..7631d828a 100644
--- a/www/common/onlyoffice/inner.js
+++ b/www/common/onlyoffice/inner.js
@@ -775,6 +775,18 @@ define([
                     view: false
                 };
             });
+            // Add an history keeper user to show that we're never alone
+            var hkId = Util.createRandomInteger();
+            p.push({
+                id: hkId,
+                idOriginal: String(hkId),
+                username: "History",
+                indexUser: i,
+                connectionId: Hash.createChannelId(),
+                isCloseCoAuthoring:false,
+                view: false
+            });
+            i++;
             if (!myUniqueOOId) { myUniqueOOId = String(myOOId) + i; }
             p.push({
                 id: myUniqueOOId,

From 3132b1816ec393d8c64b719929898e794d35eb9a Mon Sep 17 00:00:00 2001
From: yflory <yann.flory@xwiki.com>
Date: Fri, 11 Dec 2020 16:07:18 +0100
Subject: [PATCH 2/2] Spreadsheets editors are marked as viewers before they
 make a change

---
 www/common/onlyoffice/inner.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/www/common/onlyoffice/inner.js b/www/common/onlyoffice/inner.js
index 7631d828a..dc304fbe3 100644
--- a/www/common/onlyoffice/inner.js
+++ b/www/common/onlyoffice/inner.js
@@ -1313,6 +1313,8 @@ define([
                             return;
                         }
 
+                        APP.onLocal(); // Add our data to the userlist
+
                         if (APP.history) {
                             try {
                                 getEditor().asc_setRestriction(true);