### Steps to reproduce

1. Begin of the insertionLoginEnd of the insertion Begin of the deletion On Firefox, loginEnd of the deletion as a user with permissions to update and create work packages

2. Begin of the insertionHave non-working days configured in Administration / Calendar & dates / Working days and hours

3. End of the insertion Go to Project > Gantt chart

Begin of the insertion4.End of the insertion Begin of the deletion 3.End of the deletion Begin of the insertionIn any WP, openEnd of the insertion Begin of the deletion Add a start date froEnd of the deletion the Begin of the insertionDatepicker, and make sure that non-working days are excluded from the dates.

5. Hover over the row of that WP in theEnd of the insertion Gantt chart Begin of the deletion view/modalEnd of the deletion


### What is the buggy behavior?

* Begin of the insertionOn larger zoom levels, there is constantlyEnd of the insertion Begin of the deletion User initially seesEnd of the deletion a forbidden sign Begin of the insertionpopping up. However, there is no indication of non-working days. So users don't know what is going onEnd of the insertion

* Begin of the insertionOn smaller zoom levels,End of the insertion Begin of the deletion User is still able to updateEnd of the deletion the Begin of the insertionnon-working days are highlighted, so that it is clear, why it is forbiddenEnd of the insertion Begin of the deletion ticketEnd of the deletion


### What is the expected behavior?

1. Begin of the insertionOn those zoom levels where non-working days are not displayed any more, the precision is not that important. So on those levels, instead of indicating aEnd of the insertion Begin of the deletion User can update withoutEnd of the deletion forbidden sign, Begin of the insertioninternally just chose the closest working day possible. End of the insertion Begin of the deletion since they're allowed to make changesEnd of the deletion


### Screenshots and other files

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/102756/content">

### Environment information

**OpenProject version**

_v.14.0.1_

**Browser**

* Begin of the insertion[x]End of the insertion Begin of the deletion [ ]End of the deletion Chrome
* [x] Firefox
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)