add ctrl(+shift)+tab keybinds

src/windows/mainwindow.cpp

@@ -165,6 +165,14 @@ void MainWindow::GoBack() {
 void MainWindow::GoForward() {
     m_chat.GoForward();
 }
+
+void MainWindow::GoToPreviousTab() {
+    m_chat.GoToPreviousTab();
+}
+
+void MainWindow::GoToNextTab() {
+    m_chat.GoToNextTab();
+}
 #endif
 
 void MainWindow::OnDiscordSubmenuPopup() {

src/windows/mainwindow.hpp

@@ -28,6 +28,8 @@ public:
 #ifdef WITH_LIBHANDY
     void GoBack();
     void GoForward();
+    void GoToPreviousTab();
+    void GoToNextTab();
 #endif
 
     ChannelList *GetChannelList();