Keyboard Shortcuts for Auto-Type Select Dialog

[droidmonkey]

While within this selection dialog, it could work like this:

• existing: up/down select an entry from the list
• existing: enter auto-type with this entry's sequence (or default sequence obviously)
• new: any "normal" letter/number key: refine list or search, related to Allow to select entry if window not found on auto-type #429
• new: alt+1 for regular auto-type (additionally to the existing enter!)
• new: alt+2 for username only
• new: alt+3 for password only
• new: alt+4 for TOTP.

Those would be very easy to reach when you just used ctrl+alt+A: your thumb is probably already on alt and you wouldn't need to move much. For discoverability, there would probably have to be a hint somewhere about this behaviour.

Originally posted by @ccoenen in #3630 (comment)