split before words too long

src/paragraphs.rs

@@ -183,21 +183,25 @@ impl<'a> Paragraph<'a> {
                 if n_char <= line_width || to_be_split.is_empty() {
                     break;
                 }
-                match split_points.next() {
-                    None => {
-                        // No valid split point found.
+                match (split_len >= line_width, split_points.next()) {
+                    (true, _) | (_, None) => {
+                        // Either the new split is too longer,
+                        // or no valid split point was found.
                         // Drain the entire buffer once.
                         let last_index = to_be_split.len().saturating_sub(1);
                         push_line!(to_be_split.drain(..last_index));
                         split_points.reset();
                         n_char = split_len;
                         break;
                     }
-                    Some(
-                        split_point @ SplitPoint {
-                            index,
-                            n_char_after,
-                        },
+                    (
+                        _,
+                        Some(
+                            split_point @ SplitPoint {
+                                index,
+                                n_char_after,
+                            },
+                        ),
                     ) => {
                         trace!(?split_point, "next");
                         push_line!(to_be_split.drain(..index));

src/snapshots/fmtt__tests__long_link_long_description.snap

@@ -0,0 +1,6 @@
+---
+source: src/tests.rs
+expression: "&formatted"
+---
+![Math for hue-grayscale to RGB conversion on a
+whiteboard](https://github.com/SichangHe/internet_route_verification/assets/84777573/11f8ad38-403c-4e5d-99da-66176795223f)

src/snapshots/fmtt__tests__long_word.snap

@@ -2,6 +2,5 @@
 source: src/tests.rs
 expression: "&formatted"
 ---
-But,
-it chokes at very long splits such as
+But, it chokes at very long splits such as
 `this_function_does_absolutely_nothing_i_am_afraid_but_it_needs_to_be_here_or_the_program_breaks`.

src/tests.rs

@@ -60,6 +60,14 @@ fn long_link() {
     assert_snapshot!(&formatted);
 }
 
+#[test]
+fn long_link_long_description() {
+    init_tracing();
+    let input = "![Math for hue-grayscale to RGB conversion on a whiteboard](https://github.com/SichangHe/internet_route_verification/assets/84777573/11f8ad38-403c-4e5d-99da-66176795223f)";
+    let formatted = default_format(input);
+    assert_snapshot!(&formatted);
+}
+
 #[test]
 fn gpt1() {
     init_tracing();