Implements a global event filter to suppress help question mark

src/qt/bitcoin.cpp

@@ -329,6 +329,9 @@ int StartGridcoinQt(int argc, char *argv[])
     // Install global event filter that makes sure that long tooltips can be word-wrapped
     app.installEventFilter(new GUIUtil::ToolTipToRichTextFilter(TOOLTIP_WRAP_THRESHOLD, &app));
 
+    // Install global event filter that suppresses help context question mark
+    app.installEventFilter(new GUIUtil::WindowContextHelpButtonHintFilter(&app));
+
 #if QT_VERSION < 0x050000
     // Install qDebug() message handler to route to debug.log
     qInstallMsgHandler(DebugMessageHandler);

src/qt/guiutil.cpp

@@ -357,6 +357,25 @@ bool ToolTipToRichTextFilter::eventFilter(QObject *obj, QEvent *evt)
     return QObject::eventFilter(obj, evt);
 }
 
+WindowContextHelpButtonHintFilter::WindowContextHelpButtonHintFilter(QObject *parent) :
+    QObject(parent)
+{
+
+}
+
+bool WindowContextHelpButtonHintFilter::eventFilter (QObject *obj, QEvent *event)
+{
+    if (event->type () == QEvent::Create)
+    {
+        if (obj->isWidgetType ())
+        {
+            auto w = static_cast<QWidget *> (obj);
+            w->setWindowFlags (w->windowFlags () & (~Qt::WindowContextHelpButtonHint));
+        }
+    }
+    return QObject::eventFilter (obj, event);
+}
+
 #ifdef WIN32
 boost::filesystem::path static StartupShortcutPath()
 {

src/qt/guiutil.h

@@ -109,6 +109,24 @@ namespace GUIUtil
         int size_threshold;
     };
 
+    /** Qt event filter that suppress context help question mark for all windows.
+     */
+
+    class WindowContextHelpButtonHintFilter : public QObject
+    {
+        Q_OBJECT
+
+    public:
+        explicit WindowContextHelpButtonHintFilter(QObject *parent = 0);
+
+    protected:
+        bool eventFilter(QObject *obj, QEvent *evt);
+
+    private:
+        int size_threshold;
+    };
+
+
     bool GetStartOnSystemStartup();
     bool SetStartOnSystemStartup(bool fAutoStart);