Fix/multi select field grouped

[SJost]

fix multiSelectField being partial

Constructor OptionListGrouped could not be processed by function multiSelectField. This patch fixes this, using tags within the generated Html.

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Before submitting your PR, check that you've:

• Bumped the version number

After submitting your PR:

• Update the Changelog.md file with a link to your PR
• Check that CI passes (or if it fails, for reasons unrelated to your change, like CI timeouts)

[schoettl]

Oh, thanks for fixing this! I missed to handle that case when I introduced OptionListGrouped in 2021.

[SJost]

@schoettl Happy to help. Though I am not sure what to do with the remaining open instructions to update the Changelog.md? How do I know which version the PR is merged into, if at all?

[SJost]

Furthermore, in the version that I am actually using, I have an additional Maybe (SomeMessage site) argument that is used as the None Option, if isReq is False, since my users had problems with de-selecting.

I could add versions selectField' and multiSelectField' with this option, if desired, but I thought it might only dilute this PR.

[schoettl]

Furthermore, in the version that I am actually using, I have an additional Maybe (SomeMessage site) argument that is used as the None Option, if isReq is False, since my users had problems with de-selecting.

You mean your users have problems to clear the selection in the multi select field, which is usually done in desktop browsers by Ctrl + click? TBH, I would leave this to the developer and not provide an extra implementation for that.

Regarding the open checkboxes, I think you can just add a note in the changelog for the new version you set.

And it looks to me as if CI would be started at approval of a maintainer. I think it has timed-out too often.