Misc · Export and import: reasons wrap; every way out tested

feedback::InlineMessage lays its words in a block that wraps, so the
importer's reason for unread text no longer runs past the dialog. The
reader skips a leading byte order mark, names the line an unclosed
quote opened on, and logs once per reading. Tests press each Cancel,
the scrim, Export with the first format, see focus return to the
opener, read new text under an open importer, and see a field with no
column come empty.

src/feedback/messages.rs

@@ -271,7 +271,7 @@ impl RenderOnce for Callout {
     }
 }
 
-/// One line beside what it is about, in the severity's color.
+/// A line beside what it is about, in the severity's color; a long one wraps.
 #[derive(IntoElement)]
 pub struct InlineMessage {
     severity: Severity,
@@ -302,7 +302,13 @@ impl RenderOnce for InlineMessage {
                     .size(IconSize::Xs)
                     .color(tone),
             )
-            .child(self.text)
+            .child(
+                div()
+                    .debug_selector(|| "inline-message-text".into())
+                    .flex_1()
+                    .min_w_0()
+                    .child(self.text),
+            )
     }
 }
 

src/feedback/tests/states.rs

@@ -175,3 +175,28 @@ fn a_wrapped_body_pushes_the_actions_down(cx: &mut TestAppContext) {
     );
     assert!(long > short + px(24.0), "{short:?} then {long:?}");
 }
+
+/// A message too long for its box.
+struct Worded;
+
+impl Render for Worded {
+    fn render(&mut self, _: &mut Window, _: &mut Context<Self>) -> impl IntoElement {
+        div()
+            .w(px(200.0))
+            .child(crate::feedback::InlineMessage::new(
+                crate::primitives::Severity::Danger,
+                "This file does not read as CSV: line 2: a quote inside a field it did not open.",
+            ))
+    }
+}
+
+#[gpui::test]
+fn a_long_inline_message_wraps_inside_its_box(cx: &mut TestAppContext) {
+    setup(cx);
+    let (_, cx) = cx.add_window_view(|_, _| Worded);
+    cx.run_until_parked();
+    let text = cx
+        .debug_bounds("inline-message-text")
+        .expect("the words draw");
+    assert!(text.right() <= px(200.0), "{text:?}");
+}