A couple years ago D8598 made it so that C++ operators generally should use "default" sort mode, which remembers previously used sort setting. Back then all the places that needed it got changed to use this "default" one, but since then some more IO code landed, where seemingly by accident it used "sort by file name": - USD importer, - Grease Pencil exporter, - OBJ importer & exporter, - STL importer. Reviewed By: Julian Eisel Differential Revision: https://developer.blender.org/D15906