Interaction · Keys, scroll and focus: roving focus, scroll sync, type-ahead

RovingFocus keeps a row or column of items behind one Tab stop: the
arrows walk focus, Home and End reach the ends, Enter or Space presses,
and a press moves the stop without taking focus. ScrollSync keeps boxes
at one place along an axis: the pane a wheel turned leads, and a canvas
ahead of the panes copies its place before they draw. SelectableList
moves its cursor to the row that starts with the letters typed, the
letters joining within a pause and a Command letter left to the app.
forms::History becomes public as the undo manager. The gallery shows
gpui's own key bindings, a two-stroke chord waiting on its first
stroke, uniform_list, autofocus and the focus ring.

src/interaction/mod.rs

@@ -1,10 +1,14 @@
 mod resizable;
 mod rotatable;
+mod roving;
 mod selection;
+mod sync;
 
 #[cfg(all(test, feature = "test-support"))]
 mod tests;
 
 pub use resizable::Resizable;
 pub use rotatable::Rotatable;
+pub use roving::RovingFocus;
 pub use selection::SelectionArea;
+pub use sync::ScrollSync;