This fixes an issue were pressing the backspace or enter key on the keyboard when using the keypad, unexpected results occurred.
This also fixes an issue were if only one key is typed from the initial lockscreen view, the backspace key would not actually do anything.
The current lockscreen mockups were originally from this mockup: https://phabricator.kde.org/T12717
There are some issues with it however:
- The 0 key is on the right, which is a bit strange and differs from the layouts of all other platforms
- One-handed usability is worse due to 4 columns instead of 3
- Most mobile lockscreen have the keypad toward the center for one-handed usability, our keypad is stuck to the bottom
- It makes use of a lot of shadows which makes it slower to load
- It's supposed to emulate the design of the keyboard, but it doesn't look like it so it's out of place
The new design is much simpler, with a centered 3 column approach making keys much easier to reach with one hand. It also avoids the use of shadows and layers.



TODO:
- Investigate some improvements for keyboard input