New folder dialog should be able to create directories recursively
I think it is useful to be able to type "a/b/c/d" in the "New folder" dialog and have the four directories recursively created. This is supported by e.g. vscode, but currently nautilus does not accept a folder name that has a "/" in it. I think the change itself is simple, simply using g_file_make_directory_with_parents()
(or similar), but there seem to be greater ramifications of allowing paths with "/" in the new folder dialog, especially related to checking if it already exists, because - for example - that check is currently done using nautilus_directory_get_file_by_name()
which only looks in one directory.