Up/down sort arrow in file chooser tree view header is backwards relative to GTK 3
With GTK 4.6.2, the up/down arrow in the header is backwards relative to GTK 3.
In GTK 3, the down arrow in the Name column indicated that the files sort alphabetically A-Z, while the up arrow indicated that they sort reverse alphabetically Z-A. In GTK 4, the opposite is true: the down arrow indicates reverse alphabetical, and the up arrow indicates alphabetical. I suppose you could argue that either way is OK, but I suspect this is unintentional.
GTK 4 up arrow (alphabetical):
GTK 4 down arrow (reverse alphabetical):
GTK 3 up arrow (reverse alphabetical):
GTK 4 down arrow (alphabetical):