Experiment widget ghost tab

[mingyee2]

Steps to reproduce

1. Run through the “15 minutes to QCoDeS tutorial” up to [27]
2. Click both Snapshot buttons
3. Click the left snapshot tab
4. Click the Close Snapshot button

Expected behaviour

The tab closes, leaving behind the second tab created (the second one clicked)

Actual behaviour

The second tab closes, leaving behind an empty “ghost” tab for the first one clicked that cannot be closed (because the tab is now empty)

System

It would be helpful to provide such information:
Windows 10, QCoDeS 0.32.0

[jenshnielsen]

Thanks for the report. I can reproduce the issue. From reading the docs of ipywidgets its not clear how one is supposed to close a tab. There is also this stack overflow https://stackoverflow.com/questions/69452318/with-ipywidgets-how-to-close-the-tab-containing-the-button-that-is-pressed without an answer

[jenshnielsen]

I think the problem is that the modification of the tab.children inside the delete method does not work correctly.

e.g. here

tab.children = tuple(c for c in tab.children if c != output)

I have tried replacing this with just output.close() however while this seems to work it now breaks with another error while creating new tabs