To whomever made Dolphin's "Extract here, autodetect subfolder" feature - I love you
I hope this doesn't violate the low-quality rule. For those who don't know, when you right click an archive in Dolphin, the extract menu has a "Extract archive here, autodetect subfolder" option and its absolutely brilliant! If you've ever extracted a zip, tar, etc and ended up with files splattered everywhere this feature will prevent that. Basically when you choose this option it will:
Look to see if the archive has a top level folder, if it does, it will extract it normally
If it does not (so all of the files are at the top level), it will automatically create a folder for the archive and extract those top level files into it
It's something I really wish other file managers had, and is just another one of those features from the KDE team that gives me the "The developer(s) who created this also use this in their daily lives" impression (which is not to say that others don't). You can of course just open your favorite archive utility and manually check, then manually make the folder yourself and extract the files into there, but this lets me skip those couple of steps and I appreciate that so much.
It's one of the very few things I miss from Windows - the 7zip shell extension had the same feature, but literally put the autodetected folder name in the menu so you knew what it would be before even clicking. Such a small thing but so significant a UX boost.
Yeah, when I migrated back to Linux this was a baffling omission to me. I used it a lot in Windows and 7zip. Luckily I realized Plasma is awesome and Ark has this feature. Still kind of miss 7zip though.