add 'u'/'r' commands for undo/redo for now

src/gui/Window.cc

@@ -315,6 +315,12 @@ void Window::handle_keyval(uint32_t keyval)
             case 'o':
                 m_buffer_pane->enter_insert_mode(EnterInsertModeMode::NEW_LINE_AFTER);
                 break;
+            case 'r':
+                m_buffer_pane->redo();
+                break;
+            case 'u':
+                m_buffer_pane->undo();
+                break;
             case 'x':
                 m_buffer_pane->kill_character_at_cursor();
                 break;