'lo dear packagers, the Plasma team recommends applying the following patch to both Qt 5.9 and Qt 5.10 at your convenience:
https://codereview.qt-project.org/#/c/215939/ This fixes a bug causing the wrong desktop icon to look hovered after dragging an icon on the desktop (the top-left icon instead of the just-dropped one). This is not a serious bug. The patch may also fix similar issues in other UIs, though. The patch should find its way into the next Qt 5.9.x and 5.10.x releases. Cheers, Eike