From ec1201a36847f7aa942eab1b3a3d082f6daf0031 Mon Sep 17 00:00:00 2001
From: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
Date: Sat, 15 Sep 2018 18:02:14 +0300
Subject: [PATCH] Don't use systray icon on inappropriate systems

Prevent a user from losing access to the main window by minimizing it to
the tray on some systems (e.g. GNOME 3.26+).
---
 src/qt/bitcoingui.cpp    |  6 +++++-
 src/qt/optionsdialog.cpp | 14 ++++++++++++--
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 51aff08c4..4540fec4f 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -131,7 +131,9 @@ BitcoinGUI::BitcoinGUI(interfaces::Node& node, const PlatformStyle *_platformSty
     createToolBars();
 
     // Create system tray icon and notification
-    createTrayIcon(networkStyle);
+    if (QSystemTrayIcon::isSystemTrayAvailable()) {
+        createTrayIcon(networkStyle);
+    }
 
     // Create status bar
     statusBar();
@@ -585,6 +587,8 @@ void BitcoinGUI::setWalletActionsEnabled(bool enabled)
 
 void BitcoinGUI::createTrayIcon(const NetworkStyle *networkStyle)
 {
+    assert(QSystemTrayIcon::isSystemTrayAvailable());
+
 #ifndef Q_OS_MAC
     trayIcon = new QSystemTrayIcon(this);
     QString toolTip = tr("%1 client").arg(tr(PACKAGE_NAME)) + " " + networkStyle->getTitleAddText();
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index b51322394..c9871f6c6 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -23,6 +23,7 @@
 #include <QIntValidator>
 #include <QLocale>
 #include <QMessageBox>
+#include <QSystemTrayIcon>
 #include <QTimer>
 
 OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
@@ -126,6 +127,13 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
     connect(ui->proxyIpTor, &QValidatedLineEdit::validationDidChange, this, &OptionsDialog::updateProxyValidationState);
     connect(ui->proxyPort, &QLineEdit::textChanged, this, &OptionsDialog::updateProxyValidationState);
     connect(ui->proxyPortTor, &QLineEdit::textChanged, this, &OptionsDialog::updateProxyValidationState);
+
+    if (!QSystemTrayIcon::isSystemTrayAvailable()) {
+        ui->hideTrayIcon->setChecked(true);
+        ui->hideTrayIcon->setEnabled(false);
+        ui->minimizeToTray->setChecked(false);
+        ui->minimizeToTray->setEnabled(false);
+    }
 }
 
 OptionsDialog::~OptionsDialog()
@@ -211,8 +219,10 @@ void OptionsDialog::setMapper()
 
     /* Window */
 #ifndef Q_OS_MAC
-    mapper->addMapping(ui->hideTrayIcon, OptionsModel::HideTrayIcon);
-    mapper->addMapping(ui->minimizeToTray, OptionsModel::MinimizeToTray);
+    if (QSystemTrayIcon::isSystemTrayAvailable()) {
+        mapper->addMapping(ui->hideTrayIcon, OptionsModel::HideTrayIcon);
+        mapper->addMapping(ui->minimizeToTray, OptionsModel::MinimizeToTray);
+    }
     mapper->addMapping(ui->minimizeOnClose, OptionsModel::MinimizeOnClose);
 #endif