dialog autodismiss on firefox, close when changing tab

[Hadrien Lejard]

Tested on Firefox 67.0.1 with the current gallery https://dart-lang.github.io/angular_components/#/material_dialog, on the auto dissmiss example.

How to reproduce ?

• On Firefox
• Open the auto dissmissable dialog
• change tab
• return to the angular gallery tab

The dialog is closing itself, it seems the (dissmiss) event is called.

[Nicholas Shahan]

Thanks for the report.

[Hadrien Lejard]

It seems Firefox is triggering focus event on document when changing tab

https://github.com/dart-lang/angular_components/blob/37b2b4b940d91747678bd18e29c55c8a876498ee/angular_components/lib/utils/browser/events/events.dart#L126