SUMMARY
In the Desktop, if we select an icon and then start typing on the keyboard, the krunner text dialog shows up and that's what gets the keyboard input.

However, for people who like to put many files/folders on the desktop, it would be desirable to type the beginning of the icon's name and the selection would jump to it, making it easy to locate the desired icon.

Windows does this. Also Dolphin, and many file managers. It would be coherent for plasma desktop to do the same. And I think it should be the default behavior. That is what users migrating from Windows are expecting.

STEPS TO REPRODUCE
1. Select an icon on the desktop
2. Type some text on your keyboard

OBSERVED RESULT
krunner dialog shows up, and you realize you are typing into it.

EXPECTED RESULT
The icon whose name starts with the text that you typed should be selected.

Operating System: Arch Linux
KDE Plasma Version: 5.23.3
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.2
Kernel Version: 5.15.4-arch1-1 (64-bit)
Graphics Platform: X11