I experience small silly errors in my setup rather often. They are usually due to some compilation flag missing -dangers of using a source based distro, heheh) or simply the appropiate package not installed. Well, I suspect this is another of those annoyances that are probably due to some misconfiguration on my system: when I copy or move files to some folder, and there already exist files or folders with the same name, the dialog that asks what to do with those "colliding" files does not show anything but the names and the actions available.
Excuse if I "steal" from other forums, but KDE's is rather annoying to upload screenshots: you have to upload your screenshot to somewhere, copy a link, and then paste in your message instead of uploading it directly to forum.kde.org; a pain in the *ss, in sum. So please see this screenshot in this forum's first message, that's exactly what I get, except that I'm on KDE 5.
https://forum.manjaro.org/index.php?topic=15124.0

In that forum they point to a BKO bug report, and the solution they give is to compile Kdelibs with Nepomuk and Strigi support, which are obsolete and don't exist for KDE/Plasma/KF/whatever 5, not even Kdelibs exist. So, anyone has a complete view in KDE 5, and knows wich package or configuration is the key?

Thanks.

Bug: https://bugs.kde.org/show_bug.cgi?id=356278
Fixed with commit: http://commits.kde.org/kio/83578134b3dd ... bdf7428fe0

So, this time is not my fault... Heheh. Good to know, and even better to know that the solution is ready for the next KF5 revision.
Thanks for the info, dear space penguin.