WIP, publish error tracebacks on iopub #201
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This ensures that when an Output ipywidget is used as a context manager,
errors raised inside the context are rendered in the Output widget.
```
out = Output()
out
with out:
raise RuntimeError("oh no! an error occurred")
```
However, it does not suppress the error in the original cell, which is
to say the error is rendered both in the original cell and in the Output
widget. This behavior is in contrast to Jupyter Lab and Notebook, which
do suppress the error in the original cell. Fixing this is a TODO.
This patch also handles the case where an ipywidgets handler, without
the `@out.capture()` decorator, raises an exception. Such exceptions
are now seen in the log console.
TODOs:
- [ ] Suppress error in the original cell
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When I say this patch currently fails to suppress the error in the original cell, I mean this. Compare the cell outputs in Jupyter Notebook with ipykernel: 
and the cell outputs in Jupyter Lite, with this patch to pyodide-kernel: 
In Lite, the error is now incorrectly appearing in two cells, when it should only be in the Output widget's cell. |
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This ensures that when an Output ipywidget is used as a context manager, errors raised inside the context are rendered in the Output widget.
However, it does not suppress the error in the original cell, which is to say the error is rendered both in the original cell and in the Output widget. This behavior is in contrast to Jupyter Lab and Notebook, which do suppress the error in the original cell. Fixing this is a TODO.
This patch also handles the case where an ipywidgets handler, without the
@out.capture()decorator, raises an exception. Such exceptions are now seen in the log console.TODOs: