Make SendConfirmationDialog fully fledged

The property-based API has been used. Added support for the
`informativeText` and `detailedText` properties.

Author: hebasto

src/qt/sendcoinsdialog.cpp

@@ -364,8 +364,7 @@ void SendCoinsDialog::on_sendButton_clicked()
     questionString.append(QString("<br /><span style='font-size:10pt; font-weight:normal;'>(=%1)</span>")
         .arg(alternativeUnits.join(" " + tr("or") + " ")));
 
-    SendConfirmationDialog confirmationDialog(tr("Confirm send coins"),
-        questionString.arg(formatted.join("<br />")), SEND_CONFIRM_DELAY, this);
+    SendConfirmationDialog confirmationDialog(tr("Confirm send coins"), questionString.arg(formatted.join("<br />")), "", "", SEND_CONFIRM_DELAY, this);
     confirmationDialog.exec();
     QMessageBox::StandardButton retval = static_cast<QMessageBox::StandardButton>(confirmationDialog.result());
 
@@ -881,10 +880,15 @@ void SendCoinsDialog::coinControlUpdateLabels()
     }
 }
 
-SendConfirmationDialog::SendConfirmationDialog(const QString &title, const QString &text, int _secDelay,
-    QWidget *parent) :
-    QMessageBox(QMessageBox::Question, title, text, QMessageBox::Yes | QMessageBox::Cancel, parent), secDelay(_secDelay)
+SendConfirmationDialog::SendConfirmationDialog(const QString& title, const QString& text, const QString& informative_text, const QString& detailed_text, int _secDelay, QWidget* parent)
+    : QMessageBox(parent), secDelay(_secDelay)
 {
+    setIcon(QMessageBox::Question);
+    setWindowTitle(title); // On macOS, the window title is ignored (as required by the macOS Guidelines).
+    setText(text);
+    setInformativeText(informative_text);
+    setDetailedText(detailed_text);
+    setStandardButtons(QMessageBox::Yes | QMessageBox::Cancel);
     setDefaultButton(QMessageBox::Cancel);
     yesButton = button(QMessageBox::Yes);
     updateYesButton();

src/qt/sendcoinsdialog.h

@@ -108,7 +108,7 @@ class SendConfirmationDialog : public QMessageBox
     Q_OBJECT
 
 public:
-    SendConfirmationDialog(const QString &title, const QString &text, int secDelay = SEND_CONFIRM_DELAY, QWidget *parent = nullptr);
+    SendConfirmationDialog(const QString& title, const QString& text, const QString& informative_text = "", const QString& detailed_text = "", int secDelay = SEND_CONFIRM_DELAY, QWidget* parent = nullptr);
     int exec();
 
 private Q_SLOTS: