[#60578] Unable to use the date picker for stages

[dombesz]

Ticket

https://community.openproject.org/work_packages/60578

What are you trying to accomplish?

Fix the date range picker's validation preview logic on the Stages and Gates dialog. Due to a bug, the preview was triggered too early, before selecting both start and end dates. This led to an inconsistent behaviour of clearing out the input value and the selected date preventing the form to be usable.

What approach did you choose and why?

Instead of relying on the datepicker's element visiblity rely on the active class of the input field to decide whether a form preview update is required. The active class is automatically added and removed from the datepicker input, when the datepicker is open, and it's a good cue to rely on.

Merge checklist

• Added/updated tests
• Added/updated documentation in Lookbook (patterns, previews, etc)
• Tested major browsers (Chrome, Firefox, Edge, ...)

[github-actions]

Caution

The provided work package version does not match the core version

Details:

• Work package URL: https://community.openproject.org/work_packages/60578
• Work package version: not set
• Core version: 15.2.0

Please make sure that:

• The work package version OR your pull request target branch is correct