Form controls: holding Enter or Space presses a focused button once

The focused control took every pressed key event, the system's key
repeats included, so holding Enter or Space on a focused button ran its
macro or command again for each repeat. A repeat now still belongs to
the button (it doesn't reach the grid) but doesn't press it; arrows,
Page Up and Page Down held on a slider or spin button keep stepping.

crates/ui-egui/src/form_controls.rs

@@ -357,8 +357,9 @@ fn step_part(app: &mut SheetApp, c: &FormControl, part: Part) {
 }
 
 /// Keys for the focused control: arrows move by a step, Page Up and Page Down by a page, Home and
-/// End to the ends; Space or Enter presses a button. True when the key was used.
-pub fn key(app: &mut SheetApp, sh: &Sheet, key: egui::Key) -> bool {
+/// End to the ends; Space or Enter presses a button. True when the key was used. `repeat` is a key
+/// held down: it steps a slider or spin button again, but a button runs once per press.
+pub fn key(app: &mut SheetApp, sh: &Sheet, key: egui::Key, repeat: bool) -> bool {
     use egui::Key;
     let Some(c) = app.grid.focused_control.and_then(|id| find(sh, id)).cloned() else { return false };
     if app.selected_object.is_some() {
@@ -370,7 +371,9 @@ pub fn key(app: &mut SheetApp, sh: &Sheet, key: egui::Key) -> bool {
             true
         }
         (ControlKind::Button, Key::Space | Key::Enter) => {
-            app.press_button(c.id);
+            if !repeat {
+                app.press_button(c.id);
+            }
             true
         }
         (ControlKind::Button, _) => false,

crates/ui-egui/src/grid/keyboard.rs

@@ -170,7 +170,9 @@ fn grid_events(app: &mut SheetApp, ctx: &egui::Context, sh: &Sheet) -> Vec<egui:
 fn form_control_event(app: &mut SheetApp, sh: &Sheet, ev: &egui::Event) -> bool {
     match ev {
         egui::Event::Text(text) => text == " " && app.grid.focused_control.is_some() && app.selected_object.is_none(),
-        egui::Event::Key { key, pressed: true, modifiers: m, .. } => !m.command && !m.ctrl && !m.alt && crate::form_controls::key(app, sh, *key),
+        egui::Event::Key { key, pressed: true, repeat, modifiers: m, .. } => {
+            !m.command && !m.ctrl && !m.alt && crate::form_controls::key(app, sh, *key, *repeat)
+        }
         _ => false,
     }
 }

crates/ui-egui/tests/it/form_controls.rs

@@ -241,6 +241,29 @@ fn a_button_runs_its_macro_and_cmd_or_right_click_only_selects() {
     assert_eq!(cell(&h, "H1"), Value::Empty);
 }
 
+#[test]
+fn holding_enter_or_space_presses_a_focused_button_once() {
+    let (mut h, ids) = fixture();
+    let r = rect(&h, ids.button);
+    click(&mut h, r.center());
+    assert_eq!(h.state().grid.focused_control, Some(ids.button));
+    for k in [Key::Enter, Key::Space] {
+        let before = undo_len(&h);
+        // A held key: one press, then the system's repeats, then the release.
+        h.input_mut().events.push(Event::Key { key: k, physical_key: None, pressed: true, repeat: false, modifiers: Modifiers::NONE });
+        h.run_steps(1);
+        for _ in 0..5 {
+            h.input_mut().events.push(Event::Key { key: k, physical_key: None, pressed: true, repeat: true, modifiers: Modifiers::NONE });
+            h.run_steps(1);
+        }
+        h.input_mut().events.push(Event::Key { key: k, physical_key: None, pressed: false, repeat: false, modifiers: Modifiers::NONE });
+        h.run_steps(2);
+        assert_eq!(undo_len(&h), before + 1, "{k:?} ran the macro once");
+        assert_eq!(cell(&h, "H1"), Value::text("pressed"));
+        assert_eq!(cell(&h, "A20"), Value::Empty, "{k:?} typed nothing into the cell");
+    }
+}
+
 #[test]
 fn a_button_from_a_file_asks_before_it_runs() {
     use egui_kittest::kittest::Queryable as _;