From c26081f7dcbedc344d9bb2613635127e77ba4224 Mon Sep 17 00:00:00 2001
From: "Zheng, Lei" <realthunder.dev@gmail.com>
Date: Thu, 19 Sep 2019 11:41:22 +0800
Subject: [PATCH] App: fix Document::isTransactionEmpty()

---
 src/App/Document.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/App/Document.cpp b/src/App/Document.cpp
index 09f99c7326..b7f3e34884 100644
--- a/src/App/Document.cpp
+++ b/src/App/Document.cpp
@@ -1263,7 +1263,14 @@ int Document::getTransactionID(bool undo, unsigned pos) const {
 bool Document::isTransactionEmpty() const
 {
     if (d->activeUndoTransaction) {
-        return d->activeUndoTransaction->isEmpty();
+        // Transactions are now only created when there are actual changes.
+        // Empty transaction is now significant for marking external changes. It
+        // is used to match ID with transactions in external documents and
+        // trigger undo/redo there.
+
+        // return d->activeUndoTransaction->isEmpty();
+
+        return false;
     }
 
     return true;