Vuetify: [Bug Report] Indeterminate state of checkbox is not correct

[c1337r]

Environment

Vuetify Version: 2.0.4
Last working version: 2.0.0-beta.8
Vue Version: 2.6.10
Browsers: Chrome 75.0.3770.142
OS: Mac OS 10.14.6

Steps to reproduce

1. Select all items
2. Unselect any item

Expected Behavior

Headline checkbox should display indeterminate state.

Actual Behavior

Headline checkbox shows false state

Reproduction Link

https://codepen.io/s3p/pen/jgGPjm

[jacekkarczmarczyk]

Simplified repro https://codepen.io/anon/pen/YmrJza?editors=1000

[sh7dm]

ty @jacekkarczmarczyk. Oversimplified version xD: https://codepen.io/sh7dm/pen/pMWXWd?editors=1010

[cLupus]

I have observed that inputIndeterminate will not update in certain circumstances, even when it is supposed to. [in version 2.0.7]

[c1337r]

Is there anything I can do to help solving this issue?
Actually, it is a real show stopper...

[jacekkarczmarczyk]

You can create a PR :) Also there's a simple workaround using key: https://codepen.io/jkarczm/pen/LYPZwZL

[c1337r]

Thanks a lot for providing the workaround!