Implemented a new, better looking tooltip. (#158)

* Implemented a new, better looking tooltip.

* Pajlada fix.

* Fixed dragging behaving incorrectly.

* Fixed out of focus hovering getting stuck.

src/widgets/window.cpp

@@ -107,6 +107,21 @@ void Window::closeEvent(QCloseEvent *)
     this->closed();
 }
 
+void Window::changeEvent(QEvent *event)
+{
+    if(!this->isActiveWindow())
+    {
+        this->lostFocus.invoke();
+    }
+    BaseWidget::changeEvent(event);
+}
+
+void Window::leaveEvent(QEvent *event)
+{
+    this->lostFocus.invoke();
+    BaseWidget::leaveEvent(event);
+}
+
 void Window::refreshTheme()
 {
     QPalette palette;