Data menu broken in Imviz extra viewer on Lab

[pllim]

I see this on main currently so it was not caused by whatever the rotation PR is doing. Only see it on Lab. Works fine on Notebook in the same env. Using WSL2 (Debian/Ubuntu) on Windows 10/11, with Chrome browser (but @kecnry could reproduce it in OSX). cc @mariobuikhuizen

Workflow to reproduce:

1. Run Imviz example notebook and load both images.
2. Go to the cell that says imviz.show() but do not run it yet. Right click on it and select "Create New View for Cell Output".
3. Now run imviz.show().
4. Use the "popped out" version of the Imviz viewer.
5. Make a new viewer. Load either image A or B. See that Data menu in imviz-1 misbehaves.
6. See screenshots. The screenshots also have markers loaded but you don't need those to reproduce the bug.

imviz-0 is okay:

but imviz-1 is broken in Lab but not Notebook:

🐱

[pllim]

Mario found a workaround and I confirmed that doing this before starting the notebook/lab server fixes my use case:

export JUPYTER_WIDGETS_ECHO=False

❗ The catch: ipypopout is disabled when this is used.

Mario's comments as follows.

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I’ve narrowed the issue down to having 2 views in the notebook (which is the case with using sidecar in lab, but can also be achieved with have two cells with imviz.show()) and the echo-comm-message functionality (introduced for ipypopout).

I can also reproduce it in classic notebook with two cells with imviz.show().

Running Lab with it disabled, fixes the issue: JUPYTER_WIDGETS_ECHO=False jupyter lab

(but then ipypopout won’t work)

I think it should be fixed in ipywidgets. Turning it off validated my theory.

[mariobuikhuizen]

After looking further into it, the echo issue is not the only problem.

Having two views with a <v-menu :close-on-content-click="false" ...> (line), makes them close anyway when content is clicked, because for one of the menu's this is a "click outside", which closes the menu and updates the the shared model. This also causes an update of the app.state in the kernel.
This happens after the method data_item_visibility (line) is called, so the state change that happened with that is overwritten with the old state.

[mariobuikhuizen]

A fix would be to use :close-on-click="false" on the menu. This way the menu won't close when there are two views (but the menu only closes when clicking the menu button again).

This works also without a fix for the potential echo-issue.