There is a problem with the image viewing order

[og900aero]

When I look photos in a library, I noticed a bug where the order is wrong, depending on whether the file name starts with a lower or upper case letter. If there is a directory with 9 images starting with uppercase and 1 image starting with lowercase, then the image starting with a lowercase letter will be displayed last, even though it is the fifth in the library.

[nigels-com]

In ASCII the capital letters have a lower value than the lower case ones. The historical reason seems be that the initial version of ASCII (or a precursor) there were only capital letters.

From that point of view feh is ordering them in the conventional order. If there is some other order that seems more appropriate for feh first we'd need to define what that should be.

If I was doing something from scratch, perhaps I'd group the digits 0-9, then the lower case a-z, then the upper-case A-Z.
The sort criteria would be first by group, then secondarily by ASCII value.

[og900aero]

Or simply set whether it should be case sensitive or not.
I feel very underdeveloped in 2024.