turn Return key into \n instead of \r

src/gui/BufferPane.cc

@@ -302,6 +302,10 @@ void BufferPane::handle_key(uint32_t keyval)
         }
         else if (keyval <= 0xFFu)
         {
+            if (keyval == SDLK_RETURN)
+            {
+                keyval = '\n';
+            }
             m_buffer->insert_code_point(keyval);
         }
         m_window->request_redraw();