Created attachment 124982 [details]
File sorting example

SUMMARY
The current implementation of natural sorting takes the dot of the file extension into account, and this makes it so that files with numbers in their name are shown before those with the same name but without numbers. It seems like the dot of the extension is treated as part of the file name; while it is indeed part of the file name in UNIX-like OSes due to magic numbers, from a user perspective this is unintuitive as we humans treat the file name and the extension as two separate things, with the dot acting as the separator.

STEPS TO REPRODUCE
1. create three files: "file.txt", "file 2.txt", "file 3.txt";
2. use sorting by name.

OBSERVED RESULT
The files are shown in the following order: "file 2.txt", "file 3.txt", "file.txt".

EXPECTED RESULT
The files should be sorted in what we might call a "natural" way: files with a space and a number following their name should come after those without space and number in their file name. This behaviour is seen in all other desktop environments (e.g. GNOME) and operating systems (e.g. Windows).

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE neon
KDE Plasma Version: 5.17.4
KDE Frameworks Version: 5.65.0
Qt Version: 5.13.2

ADDITIONAL INFORMATION