From 5fcd29c5074a397fbca48ddfdfe39efc3331dcdf Mon Sep 17 00:00:00 2001
From: David Rosca <nowrep@gmail.com>
Date: Tue, 25 Dec 2018 11:47:35 +0100
Subject: [PATCH] Preferences: Add DNS Prefetch option

Requires QtWebEngine 5.12
---
 src/lib/app/mainapplication.cpp     | 4 ++++
 src/lib/preferences/preferences.cpp | 6 ++++++
 src/lib/preferences/preferences.ui  | 9 ++++++++-
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/lib/app/mainapplication.cpp b/src/lib/app/mainapplication.cpp
index 34634f40d..56e227f5c 100644
--- a/src/lib/app/mainapplication.cpp
+++ b/src/lib/app/mainapplication.cpp
@@ -941,6 +941,10 @@ void MainApplication::loadSettings()
     webSettings->setUnknownUrlSchemePolicy(QWebEngineSettings::AllowAllUnknownUrlSchemes);
 #endif
 
+#if QTWEBENGINEWIDGETS_VERSION >= QT_VERSION_CHECK(5, 12, 0)
+    webSettings->setAttribute(QWebEngineSettings::DnsPrefetchEnabled, settings.value(QSL("DNSPrefetch"), true).toBool());
+#endif
+
     webSettings->setDefaultTextEncoding(settings.value(QSL("DefaultEncoding"), webSettings->defaultTextEncoding()).toString());
 
     setWheelScrollLines(settings.value(QSL("wheelScrollLines"), wheelScrollLines()).toInt());
diff --git a/src/lib/preferences/preferences.cpp b/src/lib/preferences/preferences.cpp
index a9ea27f94..8b1b6aa5c 100644
--- a/src/lib/preferences/preferences.cpp
+++ b/src/lib/preferences/preferences.cpp
@@ -116,6 +116,10 @@ Preferences::Preferences(BrowserWindow* window)
     ui->webRTCPublicIpOnly->setVisible(false);
 #endif
 
+#if QTWEBENGINEWIDGETS_VERSION < QT_VERSION_CHECK(5, 12, 0)
+    ui->dnsPrefetech->setVisible(false);
+#endif
+
     auto setCategoryIcon = [this](int index, const QIcon &icon) {
         ui->listWidget->item(index)->setIcon(QIcon(icon.pixmap(32)));
     };
@@ -288,6 +292,7 @@ Preferences::Preferences(BrowserWindow* window)
     ui->useNativeScrollbars->setChecked(settings.value("UseNativeScrollbars", false).toBool());
     ui->disableVideoAutoPlay->setChecked(settings.value("DisableVideoAutoPlay", false).toBool());
     ui->webRTCPublicIpOnly->setChecked(settings.value("WebRTCPublicIpOnly", true).toBool());
+    ui->dnsPrefetch->setChecked(settings.value("DNSPrefetch", true).toBool());
 
     foreach (int level, WebView::zoomLevels()) {
         ui->defaultZoomLevel->addItem(QString("%1%").arg(level));
@@ -943,6 +948,7 @@ void Preferences::saveSettings()
     settings.setValue("UseNativeScrollbars", ui->useNativeScrollbars->isChecked());
     settings.setValue("DisableVideoAutoPlay", ui->disableVideoAutoPlay->isChecked());
     settings.setValue("WebRTCPublicIpOnly", ui->webRTCPublicIpOnly->isChecked());
+    settings.setValue("DNSPrefetch", ui->dnsPrefetch->isChecked());
 
 #ifdef Q_OS_WIN
     settings.setValue("CheckDefaultBrowser", ui->checkDefaultBrowser->isChecked());
diff --git a/src/lib/preferences/preferences.ui b/src/lib/preferences/preferences.ui
index 45417bf63..c20143f22 100644
--- a/src/lib/preferences/preferences.ui
+++ b/src/lib/preferences/preferences.ui
@@ -1075,6 +1075,13 @@
                    </property>
                   </widget>
                  </item>
+                 <item>
+                  <widget class="QCheckBox" name="dnsPrefetch">
+                   <property name="text">
+                    <string>Enable DNS prefetching</string>
+                   </property>
+                  </widget>
+                 </item>
                 </layout>
                </item>
                <item row="2" column="0">
@@ -2394,7 +2401,7 @@
                 <x>0</x>
                 <y>0</y>
                 <width>96</width>
-                <height>31</height>
+                <height>28</height>
                </rect>
               </property>
               <layout class="QHBoxLayout" name="horizontalLayout_14">