Fixed #1647: help dialog is not system-modal now

src/gui/Help.cpp

@@ -77,10 +77,10 @@ Help::~Help()
     delete m_dialog;
 }
 
-Help* Help::getHelpWindow(QWidget*)
+Help* Help::getHelpWindow(QWidget* w)
 {
     if (help_window == NULL)
-        help_window = new Help(NULL, "Firewall Builder");
+        help_window = new Help(w, "Firewall Builder");
 
     //if (parent != mw) help_window->setParent(parent, help_window->flags);
     return help_window;

src/gui/helpview_q.ui

@@ -1,6 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
  <class>HelpView_q</class>
  <widget class="QMainWindow" name="HelpView_q">
+  <property name="windowModality">
+   <enum>Qt::ApplicationModal</enum>
+  </property>
   <property name="geometry">
    <rect>
     <x>0</x>