Collapse and Expand all groups feature

[MichaelBuessemeyer]

This PR adds two additional buttons to the small dropdown menu of all groups in the tree hierarchy view. These buttons make it possible to collapse and expand all groups.

URL of deployed dev instance (used for testing):

• https://addcollapseallgroups.webknossos.xyz/

Steps to test:

• Open a skeleton/hybrid tracing and create some groups and trees. Make sure you also put groups into each other to also test "complex" hierarchies.
• Use the two new buttons in the dropdown menu of any group. This should collapse or expand all subgroups.

Issues:

• fixes Add way to collapse all tree groups #4115

---

• Updated changelog
• [ ] Updated migration guide if applicable
• Updated documentation if applicable
• [ ] Adapted wk-connect if datastore API changes
• [ ] Needs datastore update after deployment
• Ready for review

[daniel-wer]

Nice, really helpful feature :)

I'm not sure whether the location of this button is intuitive and discoverable, though.
@philippotto Do you maybe have a better idea?
Otherwise good to merge as-is :)

[philippotto]

Awesome 👍

I'm not sure whether the location of this button is intuitive and discoverable, though.
@philippotto Do you maybe have a better idea?

Georg suggested to use shift (or ctrl) click on the +/- icons of the groups. Not sure, though, how feasible this is with the tree library.

Two things which we could add for this feature:

• possibility to expand all groups at once (i.e., it would be a toggle button which switches between these two modes)
• have the collapse/expand functionality per tree group (instead only for the root)

However, I'm fine with the current state, too. The biggest pain point should be already solved by the PR.

[MichaelBuessemeyer]

Two things which we could add for this feature:

• possibility to expand all groups at once (i.e., it would be a toggle button which switches between these two modes)
• have the collapse/expand functionality per tree group (instead only for the root)

@daniel-wer I added the additional thinks mentioned by phillipp.

Could you please check my changes again 🙂

@philippotto

Georg suggested to use shift (or ctrl) click on the +/- icons of the groups. Not sure, though, how feasible this is with the tree library.

Unfortunalty your are right here. The interface of the library does not provide enough information for that. Access to the click event is missing here :/