From 4a057c181373626f6e1538a2edf46cc4741fe7bf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Wolfgang=20St=C3=B6ggl?= <c72578@yahoo.de>
Date: Sun, 8 Nov 2020 15:06:14 +0100
Subject: [PATCH] Set _q_readonly property for online-help (#2890)

- Setting _q_readonly disables the timestamp check of the registered
  online-help.qch file
- This enables displaying of Contents and Index of the online help,
  even if the timestamp of online-help.qch is slightly different.
  Differences in the timestamp can result from packing online-help.qch
  in a cab file, when building the installer (1 or 2 seconds) or from
  installing the file under a different timezone under Linux etc.
- Remark: Qt 5.14 or newer is required to display Contents or Index,
  when the help files are readonly
---
 gui/helpdialog.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gui/helpdialog.cpp b/gui/helpdialog.cpp
index c158c8092f..ce24aa1c3a 100644
--- a/gui/helpdialog.cpp
+++ b/gui/helpdialog.cpp
@@ -66,6 +66,8 @@ HelpDialog::HelpDialog(QWidget *parent) :
     }
 
     mHelpEngine = new QHelpEngine(helpFile);
+    // Disable the timestamp check of online-help.qhc by setting _q_readonly
+    mHelpEngine->setProperty("_q_readonly", QVariant::fromValue<bool>(true));
     mHelpEngine->setupData();
 
     mUi->contents->addWidget(mHelpEngine->contentWidget());