IME · the candidate box clamps to the last layout: asked before the next one, it found nothing and macOS put it in the screen's corner (#7)

src/forms/tests/stale.rs

@@ -1,4 +1,4 @@
-use gpui::{AppContext, Context, IntoElement, Render, TestAppContext, Window};
+use gpui::{AppContext, Context, EntityInputHandler, IntoElement, Render, TestAppContext, Window};
 
 use super::setup;
 use crate::forms::{TextInput, UnitInput};
@@ -45,3 +45,24 @@ fn a_unit_gone_from_its_list_keeps_the_field(cx: &mut TestAppContext) {
     cx.run_until_parked();
     assert!(cx.debug_bounds("number-root").is_some());
 }
+
+#[gpui::test]
+fn an_ime_finds_its_composition_before_the_next_layout(cx: &mut TestAppContext) {
+    let (fields, cx) = super::open(1, false, cx);
+    let field = fields[0].clone();
+    super::focus(&field, cx);
+    field.update(cx, |input, cx| input.set_text("abc", cx));
+    cx.run_until_parked();
+    let laid = field
+        .read_with(cx, |input, _| input.bounds_for(3))
+        .expect("laid out");
+    let asked = cx.update(|window, cx| {
+        field.update(cx, |input, cx| {
+            input.replace_and_mark_text_in_range(None, "n", None, window, cx);
+            let at = gpui::Bounds::new(laid.origin, gpui::size(gpui::px(200.), laid.size.height));
+            input.bounds_for_range(3..4, at, window, cx)
+        })
+    });
+    let asked = asked.expect("the candidate box has a place");
+    assert_eq!(asked.origin, laid.origin, "at the caret, on its line");
+}