Onboarding · Help: articles in a list the keyboard walks, a long address cut

HelpPanel lists its articles in lists::SelectableList: the list is one
stop whose cursor scrolls into view, and Enter or a double press opens
an article, focus going to All articles as before. SelectableList now
activates on Enter's release, armed by its own press, as the palette
and menus pick: an activation that moves focus left the release to
press what took it, here the way back. ContactSupport cuts a long
address in the middle and puts a Copy beside it. The lists tests move
into a folder, the release tests on their own.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/lists/select.rs

@@ -47,13 +47,14 @@ struct Cursor {
     scroll: ScrollHandle,
     seen: Option<Vec<SharedString>>,
     sent: Option<Vec<SharedString>>,
+    armed: bool,
 }
 
 type OnSelect = Rc<dyn Fn(&[SharedString], &mut Window, &mut App)>;
 type OnActivate = Rc<dyn Fn(&SharedString, &mut Window, &mut App)>;
 type Picker = Rc<dyn Fn(usize, Pick, &mut Window, &mut App)>;
 
-/// Rows you select. A press picks one; with `multiple`, Cmd-press adds or drops one and Shift-press takes the range from the last pick. Up and Down move, Shift with them extends, Space toggles, Cmd-A takes all. Keys pass over disabled rows, and no pick adds one.
+/// Rows you select. A press picks one; with `multiple`, Cmd-press adds or drops one and Shift-press takes the range from the last pick. Up and Down move, Shift with them extends, Space toggles, Cmd-A takes all, and Enter activates the row on its release, so an activation that moves focus leaves the release nothing to press. Keys pass over disabled rows, and no pick adds one.
 #[derive(IntoElement)]
 pub struct SelectableList {
     id: ElementId,
@@ -235,6 +236,8 @@ impl RenderOnce for SelectableList {
                     })
             })
             .collect();
+        let (lifted, released, barred_rows, keyed) =
+            (cursor.clone(), activate.clone(), off.clone(), keys.clone());
         self.base
             .id(self.id)
             .track_focus(&focus)
@@ -243,6 +246,22 @@ impl RenderOnce for SelectableList {
             .flex()
             .flex_col()
             .gap_0p5()
+            .on_key_up(move |event, window, cx| {
+                if event.keystroke.key != "enter" || count == 0 {
+                    return;
+                }
+                let (armed, at) = lifted.update(cx, |cursor, _| {
+                    (std::mem::take(&mut cursor.armed), cursor.at.min(count - 1))
+                });
+                if !armed {
+                    return;
+                }
+                cx.stop_propagation();
+                if barred_rows[at] {
+                    return;
+                }
+                released(&keyed[at], window, cx);
+            })
             .on_key_down(move |event, window, cx| {
                 if count == 0 {
                     return;
@@ -259,9 +278,7 @@ impl RenderOnce for SelectableList {
                     "space" => (Some(at).filter(open), Pick::Toggle),
                     "enter" => {
                         cx.stop_propagation();
-                        if open(&at) {
-                            activate(&keys[at], window, cx);
-                        }
+                        cursor.update(cx, |cursor, _| cursor.armed = !held.modified());
                         return;
                     }
                     "a" if held.platform => (Some(at), Pick::All),