[Bug Report] V-dialog does not retain focus

[avenmore]

Environment

Vuetify Version: 2.0.19
Last working version: 2.0.11
Vue Version: 2.6.10
Browsers: Firefox 69.0
OS: Windows 10

Steps to reproduce

Show a dialog and press tab repeatedly.

Expected Behavior

When pressing tab, the focus cycles back to the first control of the dialog after the last control has been focused.

Actual Behavior

The focus goes out of the dialog, cycling through the page behind.

Reproduction Link

https://codepen.io/avenmore/pen/WNeBOZr

Other comments

Can be shown to be working in 2.0.11 in this pen (sorry, not mine, created to demo another problem). Setting "retain-focus" on the dialog has no effect.

[KaelWD]

fa0a893, #8459

@johnleider 3681cd5 was done specifically to allow for an override in cases like that