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/forms/text/edit.rs

@@ -94,7 +94,7 @@ pub(crate) struct Snapshot {
 const JOIN: Duration = Duration::from_millis(900);
 
 /// Undo and redo as whole snapshots of what an editor holds.
-pub(crate) struct History<S> {
+pub struct History<S> {
     undo: Vec<S>,
     redo: Vec<S>,
     typing_since: Option<Instant>,