Launch Feedback KCM was not saving the cursor notifications properly - `Apply` button would not activate, `klaunchrc` was not being updated. QML was using calls to `Qt.later()` before setting the radio button index, generating "unknown property" errors from QML and not emitting the change signal. Simply removed those calls and the QML functions properly, and `klaunchrc` is updated correctly.
Per @davidedmundson, `Qt.later()` may be too new of a function to be supported by Plasma.
NOTE: I was getting occasional and random segmentation faults (missing shared library?) while testing this fix. I'm reasonably certain my environment is at fault, but I need another pair of experienced eyes to investigate. I'll write a suitable test plan once that's resolved.
BUG: 392050