Don't number empty regions of broken block equations (#4836)

4 files changed, 16 insertions, 0 deletions

diff --git a/tests/ref/issue-4829-math-pagebreaking-wrong-number.png b/tests/ref/issue-4829-math-pagebreaking-wrong-number.png
new file mode 100644
index 00000000..1db8a511
--- /dev/null
+++ b/tests/ref/issue-4829-math-pagebreaking-wrong-number.png
diff --git a/tests/ref/math-equation-number-empty.png b/tests/ref/math-equation-number-empty.png
new file mode 100644
index 00000000..9311f114
--- /dev/null
+++ b/tests/ref/math-equation-number-empty.png
diff --git a/tests/suite/math/equation.typ b/tests/suite/math/equation.typ
index 2345de54..6cdf7b7e 100644
--- a/tests/suite/math/equation.typ
+++ b/tests/suite/math/equation.typ
@@ -256,6 +256,10 @@ $ q &= sum_k ln A \
   ],
 )
 
+--- math-equation-number-empty ---
+// Test numbering on empty equations.
+#math.equation(numbering: "1", block: true, [])
+
 --- issue-4187-alignment-point-affects-row-height ---
 // In this bug, a row of "-" only should have a very small height; but
 // after adding an alignment point "&", the row gains a larger height.
diff --git a/tests/suite/math/multiline.typ b/tests/suite/math/multiline.typ
index 35f10ea4..b6d970f3 100644
--- a/tests/suite/math/multiline.typ
+++ b/tests/suite/math/multiline.typ
@@ -133,3 +133,15 @@ $ a &+ b + & c \
 --- issue-1948-math-text-break ---
 // Test text with linebreaks in math.
 $ x := "a\nb\nc\nd\ne" $
+
+
+--- issue-4829-math-pagebreaking-wrong-number ---
+// Test numbering of empty regions of broken equations.
+#set page(height: 5em)
+#set math.equation(numbering: "1")
+#show math.equation: set block(breakable: true)
+
+#rect(height: 1.5em)
+
+$ a + b \
+  a + b $