Indeterminate status in combobox

[armeireles]

Is your feature request related to a problem?

We are implementing a edit in batch feature that is using the combobox component. However we are frustating since it does not adapt to a use case.

For example:

• user 1 belongs to group1 and group 2
• user 2 belongs to group2 and group 3
• user 3 belongs to group2

When we choose to change groups of users in batch and open the combobox this should be the result inside the combobox:

group 1 - indeterminate Group 2 - true Group 3 - indeterminate Group 4 - false

However in combobox we only have true/falae options...

Describe the solution you'd like

add the option of "indeterminate" status in the combobox component

Describe alternatives you've considered

For now, while we wait to see if you can quickly add this third state of indeterminate we choose to add a text saying (indeterminate) in front of the option in the combobox and leave it has false. but has to be temporary.

If you not improve this quickly then our only chance is to implement a treegrid or a tree for this. But in terms of amount work and interface is not a good option.

Additional context

Some pics