This file is rather big. I'm working in it quite a lot, and find it very
hard to navigate in. I constantly get lost or spend time manually
looking for things.
Move the file to a directory, add an internal header, and split out
filtering and sorting code into own files. I'm sticking with these for
now to not cause too many conflicts with blender/blender!130543, which
does a lot of changes/additions to filelist.cc.
Pull Request: https://projects.blender.org/blender/blender/pulls/141744
dd81681583