Added ability to open last tab with Ctrl+9. (Chromium behaviour.)

- Fixed #1106.

src/widgets/Notebook.cpp

@@ -256,6 +256,17 @@ void Notebook::selectPreviousTab()
     this->select(this->items_[index].page);
 }
 
+void Notebook::selectLastTab()
+{
+    const auto size = this->items_.size();
+    if (size <= 1)
+    {
+        return;
+    }
+
+    this->select(this->items_[size - 1].page);
+}
+
 int Notebook::getPageCount() const
 {
     return this->items_.count();

src/widgets/Notebook.hpp

@@ -34,6 +34,7 @@ public:
     void selectIndex(int index);
     void selectNextTab();
     void selectPreviousTab();
+    void selectLastTab();
 
     int getPageCount() const;
     QWidget *getPageAt(int index) const;

src/widgets/Window.cpp

@@ -287,7 +287,7 @@ void Window::addShortcuts()
     createWindowShortcut(this, "CTRL+8",
                          [this] { this->notebook_->selectIndex(7); });
     createWindowShortcut(this, "CTRL+9",
-                         [this] { this->notebook_->selectIndex(8); });
+                         [this] { this->notebook_->selectLastTab(); });
 
     // Zoom in
     {