Vertical tabs (#1815)

* Vertical tabs

* Vertical tab wrapping

* Fix formatting

* Cleanup code

* Updated changelog

* Hide button row if no buttons exist

* Fix tab width expansion

Co-authored-by: fourtf <tf.four@gmail.com>

src/widgets/Window.cpp

@@ -64,6 +64,9 @@ Window::Window(WindowType type)
     if (type == WindowType::Main)
     {
         this->resize(int(600 * this->scale()), int(500 * this->scale()));
+        getSettings()->tabDirection.connect([this](int val) {
+            this->notebook_->setTabDirection(NotebookTabDirection(val));
+        });
     }
     else
     {