KeySequenceItem: Several usability fixes
- Disable clear button when there's no key sequence
- Cancel sequence recording when pressing the button
- Remove workaround, it was addressed upstream
- Show a cancel button when recording
- Allow detecting when the key sequence is cleared
BUG: 458796 BUG: 458798 BUG: 458799
Depends on kguiaddons!64 (merged)
Edited by Aleix Pol Gonzalez