move cursor down a row when inserting a \n

src/gui/BufferPane.cc

@@ -305,6 +305,7 @@ void BufferPane::handle_key(uint32_t keyval)
             if (keyval == SDLK_RETURN)
             {
                 keyval = '\n';
+                m_cursor_screen_row++;
             }
             m_buffer->insert_code_point(keyval);
         }