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KDE Goes and Does It (Double-Click By Default, That Is) - OMG! Linux
(www.omglinux.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
To be fair, even when both UI elements are both a part of Dolphin, the element shown when selecting files in a browser is different than a default Dolphin instance. In-browser you are selecting where to download a file, or what file to upload, and it is assumed that you don't intend to open a file locally, so turning off single click in this instance is actually pretty intuitive.