[Feature Request] Treeview - force at least one node active

Problem to solve

I would like to force the user to have at least one treeview node active. User should not be able to deactivate active node. For v-list-group we have mandatory prop which does exactly this.

Proposed solution

Add new prop mandatory-active for treeview. When this prop is true, at least one treeview node must be active -> similar behavior to mandatory prop in v-list-group.

[mDemianchuk]

+1

In one of my projects, I use v-treeview for site navigation, where every leaf is a link to a component. I can get the active leaf using @update:active which produces an array of active leaves and then I grab the first one. However, if I click on the same leaf again, it deactivates it, so the resulting array of @update:active is empty. Of course, I can handle a case like that, but it still messes up my css, as that leaf element drops its v-treeview-node--active class.

A simple case like that requires lots of manual work, so having an out-of-the-box feature like this would be very helpful!

[Mikilll94]

@escapedcat This is not a solution. I want to force the user to have at least one treeview node active. Your proposition is not related to active state and it does not work. Error message is not a solution.