gui: Reject options dialog when key escape is pressed

Author: promag

src/qt/optionsdialog.cpp

@@ -115,6 +115,10 @@ OptionsDialog::OptionsDialog(QWidget *parent, bool enableWallet) :
     mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
     mapper->setOrientation(Qt::Vertical);
 
+    GUIUtil::ItemDelegate* delegate = new GUIUtil::ItemDelegate(mapper);
+    connect(delegate, &GUIUtil::ItemDelegate::keyEscapePressed, this, &OptionsDialog::reject);
+    mapper->setItemDelegate(delegate);
+
     /* setup/change UI elements when proxy IPs are invalid/valid */
     ui->proxyIp->setCheckValidator(new ProxyAddressValidator(parent));
     ui->proxyIpTor->setCheckValidator(new ProxyAddressValidator(parent));