Files · Explorer: a folder as a list, tiles or columns, with one path and one order

FileExplorer shows the folder at the end of a path three ways: the
directory listing, a grid of tiles, or a column per folder along the
path with the next folder lit. Its name, its count and a switch of views
sit above one path bar that climbs. A folder opens in place; a file goes
to the host, which lists each folder it goes to. A pick in an earlier
column closes the columns past it, and a new deepest column scrolls into
view. The directory listing takes its pick from its owner and reports
it, so the pick carries across views; its path bar and its first order
are shared. The gallery walks a small file system and shows the tree,
the context menu, renaming in place and a drop zone in use.

src/lists/mod.rs

@@ -12,6 +12,7 @@ mod tests;
 mod tree;
 
 pub use directory::{DirEntry, DirectoryListing};
+pub(crate) use directory::{OnClimb, listed, path_bar};
 pub use files::{FileTree, GitStatus};
 pub use grouped::GroupedList;
 pub use item::{List, ListItem};