Wrong dialog is interacted with when a dialog shows in front of permission dialog

[nbolton]

Run a program that triggers the Portal permission dialog, then immediately shows another dialog (e.g. Synergy 3)

Expected: Portal dialog is re-surfaced and interacted with
Actual: The other dialog is interacted with

Cause: After we surface the Portal dialog, we pause for 0.5s to wait for the Portal dialog to animate, but in the meantime if another dialog shows, then this will get interacted with instead.

Potential solutions:

1. Wait until after the pause before surfacing the Portal dialog
2. Loop the check/show Portal dialog until it's visible, then interact with it