Update SingleApplication to v3.5.1 version

SingleApplication/Windows.md

@@ -1,46 +1,21 @@
-Windows Specific Implementations
-================================
+# Windows Specifics
 
-Setting the foreground window
------------------------------
+## Setting the foreground window
 
 In the `instanceStarted()` example in the `README` we demonstrated how an
 application can bring it's primary instance window whenever a second copy
 of the application is started.
 
 On Windows the ability to bring the application windows to the foreground is
-restricted, see [`AllowSetForegroundWindow()`][AllowSetForegroundWindow] for more
-details.
+restricted, see [AllowSetForegroundWindow()](https://msdn.microsoft.com/en-us/library/windows/desktop/ms632668.aspx) for more details.
 
 The background process (the primary instance) can bring its windows to the
 foreground if it is allowed by the current foreground process (the secondary
 instance). To bypass this `SingleApplication` must be initialized with the
-`allowSecondary` parameter set to `true` and the `options` parameter must
-include `Mode::SecondaryNotification`, See `SingleApplication::Mode` for more
-details.
+`allowSecondary` parameter set to `true` .
 
-Here is an example:
+If the widget is minimized to Windows task bar, `QWidget::raise()` or
+`QWidget::show()` can not bring it to the front, you have to use Windows API
+`ShowWindow()` .
 
-```cpp
-if( app.isSecondary() ) {
-    // This API requires LIBS += User32.lib to be added to the project
-    AllowSetForegroundWindow( DWORD( app.primaryPid() ) );
-}
-
-if( app.isPrimary() ) {
-    QObject::connect(
-        &app,
-        &SingleApplication::instanceStarted,
-        this,
-        &App::instanceStarted
-    );
-}
-```
-
-```cpp
-void App::instanceStarted() {
-    QApplication::setActiveWindow( [window/widget to set to the foreground] );
-}
-```
-
-[AllowSetForegroundWindow]: https://msdn.microsoft.com/en-us/library/windows/desktop/ms632668.aspx
+You can find [demo code](examples/windows_raise_widget/main.cpp) in the examples directory.