Import combined Enhanced viewport: zoom out, overlays & tooltips (r53_27127) patch

https://www.tt-forums.net/viewtopic.php?f=33&t=53394

src/osk_gui.cpp

@@ -206,7 +206,7 @@ struct OskWindow : public Window {
 		this->parent->SetWidgetDirty(this->text_btn);
 	}
 
-	virtual void OnFocusLost()
+	virtual void OnFocusLost(Window *newly_focused_window)
 	{
 		VideoDriver::GetInstance()->EditBoxLostFocus();
 		delete this;