Wallet password prompt should appear above "Loading" overlay

[grishick]

When my DApp sends a transaction, I want to lock the screen with "Loading" or "Working" or some kind of similar overlay until the transaction succeeds or fails. However, if I call $service.loadingOn() before making the transaction call, then password prompt will appear underneath "Loading" overlay. If I do not call $service.loadingOn(), then the UI remains active and the user can navigate away from current screen before password prompt appears, because the password prompt may take from a second to a couple of minutes to appear.

[hacktar]

couple of minutes? this is due to some lag in connection ...

[grishick]

Whether 2 minutes or even 10 seconds, this is enough time for user to navigate away from the current page and then the password prompt will popup unexpectedly while user is doing something else. I think in mobile apps we should expect that network lag may happen any time.