st-entry: Support peeking of passwords
There is a huge benefit of peeking passwords in the various password entries. In this patch, the CAPSLOCK on indicator is being replaced with the a "peek-password" secondary icon.
The StEntry only supports two emblems: the primary-icon (aligned left) and a secondary-icon (aligned right). It cannot support both emblems present on the same side. As per design point of view, CAPSLOCK on indicator is much less of a useful feature when we have the capability for allowing peeking of passwords.
Few in-action screencasts:
- Polkit Auth : Peek_2019-08-09_16-34