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/generative/prompt.rs

@@ -16,7 +16,7 @@ use crate::{
 
 type OnText = Rc<dyn Fn(&str, &mut Window, &mut App)>;
 
-/// Byte ranges of `new` that `old` lacks, word by word: neighbors joined, spaces and punctuation trimmed from each end.
+/// Byte ranges of `new` that `old` lacks, word by word: neighbors joined, and anything but letters and digits trimmed from each end.
 pub(crate) fn added_words(old: &str, new: &str) -> Vec<Range<usize>> {
     let diff = TextDiff::from_unicode_words(old, new);
     let mut ranges: Vec<Range<usize>> = Vec::new();
@@ -37,7 +37,7 @@ pub(crate) fn added_words(old: &str, new: &str) -> Vec<Range<usize>> {
         .into_iter()
         .filter_map(|range| {
             let word = &new[range.clone()];
-            let glue = |ch: char| ch.is_whitespace() || ch.is_ascii_punctuation();
+            let glue = |ch: char| !ch.is_alphanumeric();
             let start = range.start + word.len() - word.trim_start_matches(glue).len();
             let end = range.end - (word.len() - word.trim_end_matches(glue).len());
             (start < end).then_some(start..end)
@@ -145,7 +145,7 @@ impl RenderOnce for PromptEnhancer {
             ..HighlightStyle::default()
         };
         let card = div()
-            .mt_1()
+            .mt_3()
             .flex()
             .flex_col()
             .gap_3()
@@ -202,9 +202,8 @@ impl RenderOnce for PromptEnhancer {
             .w_full()
             .flex()
             .flex_col()
-            .gap_2()
             .child(Input::new(&self.field))
-            .children(enhance.map(|button| div().flex().justify_end().child(button)))
+            .children(enhance.map(|button| div().mt_2().flex().justify_end().child(button)))
             .child(
                 Transition::new((self.id.clone(), "offered"), shown)
                     .entrance(Entrance::Rise)
@@ -231,6 +230,10 @@ mod tests {
             ["pale limestone"],
             "a comma added after a kept word stays plain"
         );
+        let new = "白い中庭，朝の光";
+        let ranges = added_words("白い中庭", new);
+        let words: Vec<&str> = ranges.iter().map(|range| &new[range.clone()]).collect();
+        assert_eq!(words, ["朝の光"], "any script's punctuation stays plain");
         assert!(added_words("same words", "same words").is_empty());
         let whole = 2..7;
         assert_eq!(added_words("", "  a cat "), [whole]);