Forms: Cmd-Enter submits from any control in a form

Form sets the ElyForm key context and binds secondary-enter to Submit
under it, so a focused tile, chip or button submits too. The prompt
enhancer's wash trims anything but letters and digits from its runs,
its spacing sits on its parts so nothing gaps at rest, and its tests
check that the field takes focus back.

src/forms/tests/structure.rs

@@ -4,7 +4,10 @@ use gpui::{
 };
 
 use super::setup;
-use crate::forms::{FieldArray, Form, FormField, Input, InputEvent, TextInput};
+use crate::{
+    buttons::Button,
+    forms::{FieldArray, Form, FormField, Input, InputEvent, TextInput},
+};
 
 struct Signup {
     name: Entity<TextInput>,
@@ -27,13 +30,13 @@ impl Render for Signup {
                     .required()
                     .child(Input::new(&self.name)),
             )
+            .child(Button::new("signup-save", "Save"))
     }
 }
 
-#[gpui::test]
-fn cmd_enter_in_a_field_submits_the_form_once(cx: &mut TestAppContext) {
+fn signup(cx: &mut TestAppContext) -> (Entity<Signup>, &mut VisualTestContext) {
     setup(cx);
-    let (view, cx) = cx.add_window_view(|window, cx| {
+    cx.add_window_view(|window, cx| {
         let name = cx.new(|cx| TextInput::new(window, cx));
         cx.subscribe(&name, |view: &mut Signup, _, event, _| {
             if *event == InputEvent::Submit {
@@ -46,7 +49,12 @@ fn cmd_enter_in_a_field_submits_the_form_once(cx: &mut TestAppContext) {
             sent: 0,
             field_submits: 0,
         }
-    });
+    })
+}
+
+#[gpui::test]
+fn cmd_enter_in_a_field_submits_the_form_once(cx: &mut TestAppContext) {
+    let (view, cx) = signup(cx);
     cx.update(|window, _| window.focus_next());
     cx.simulate_input("Ada");
     cx.simulate_keystrokes("cmd-enter");
@@ -54,6 +62,21 @@ fn cmd_enter_in_a_field_submits_the_form_once(cx: &mut TestAppContext) {
     assert_eq!(counts, (1, 0));
 }
 
+#[gpui::test]
+fn cmd_enter_on_any_control_in_a_form_submits_it(cx: &mut TestAppContext) {
+    let (view, cx) = signup(cx);
+    cx.update(|window, _| {
+        window.focus_next();
+        window.focus_next();
+    });
+    cx.simulate_keystrokes("cmd-enter");
+    assert_eq!(
+        view.read_with(cx, |view, _| view.sent),
+        1,
+        "the button holds focus"
+    );
+}
+
 struct Rows {
     rows: Vec<&'static str>,
 }