[Touchpad applet] Close query dialog on focus loss
Popup asking whether touchpad should be disabled stays open and can be covered by others, for example volume slider.
It is inconsistent since other elements of tray close themselves after switching away.
Depends on: D24825
- Disconnect all mouses
- Click the touchpad icon
- Try to dismiss it like every other tray plasmoid, for example by clicking on some other window.
- Popup should consider itself dismissed
Differential Revision: https://phabricator.kde.org/D25158