Broken in jupyter qtconsole

When start in qtconsole like
```
jupyter-qtconsole --kernel=gophernotes
```
Enter pressed, the terminal show following messages:
```
2020/12/22 19:19:46 Unhandled shell message: history_request
2020/12/22 19:19:50 Unhandled shell message: is_complete_request
```
and statement is not executed.

**VERSIONS:**
jupyter core : 4.7.0
jupyter-notebook : 6.1.5
qtconsole : 4.7.7
ipython : 7.19.0
ipykernel : 5.3.4
jupyter client : 6.1.7
jupyter lab : 2.2.9
nbconvert : 6.0.7
ipywidgets : not installed
nbformat : 5.0.8
traitlets : 5.0.5