Fix optimized linebreaks without justification (#5236)

3 files changed, 17 insertions, 1 deletions

diff --git a/crates/typst/src/layout/inline/linebreak.rs b/crates/typst/src/layout/inline/linebreak.rs
index f5048aae..aa62d487 100644
--- a/crates/typst/src/layout/inline/linebreak.rs
+++ b/crates/typst/src/layout/inline/linebreak.rs
@@ -597,7 +597,7 @@ fn raw_cost(
     let badness = if ratio < metrics.min_ratio(approx) {
         // Overfull line always has maximum cost.
         1_000_000.0
-    } else if justify || ratio < 0.0 {
+    } else if breakpoint != Breakpoint::Mandatory || justify || ratio < 0.0 {
         // If the line shall be justified or needs shrinking, it has normal
         // badness with cost 100|ratio|^3. We limit the ratio to 10 as to not
         // get to close to our maximum cost.
diff --git a/tests/ref/issue-5235-linebreak-optimized-without-justify.png b/tests/ref/issue-5235-linebreak-optimized-without-justify.png
new file mode 100644
index 00000000..b36dc406
--- /dev/null
+++ b/tests/ref/issue-5235-linebreak-optimized-without-justify.png
diff --git a/tests/suite/layout/inline/linebreak.typ b/tests/suite/layout/inline/linebreak.typ
index 8371d76e..e4b04b24 100644
--- a/tests/suite/layout/inline/linebreak.typ
+++ b/tests/suite/layout/inline/linebreak.typ
@@ -123,3 +123,19 @@ For info see #link("https://myhost.tld").
 // - shaping that results in multiple glyphs in the same cluster
 #set text(font: "Noto Sans Thai")
 #h(85pt) งบิก
+
+--- issue-5235-linebreak-optimized-without-justify ---
+#set page(width: 207pt, margin: 15pt)
+#set text(11pt)
+
+#set par(linebreaks: "simple")
+Some texts feature many longer
+words. Those are often exceedingly
+challenging to break in a visually
+pleasing way.
+
+#set par(linebreaks: "optimized")
+Some texts feature many longer
+words. Those are often exceedingly
+challenging to break in a visually
+pleasing way.