Fix sticky blocks at the top of blocks and pages (#5581)

Co-authored-by: Laurenz <laurmaedje@gmail.com>

4 files changed, 25 insertions, 0 deletions

diff --git a/tests/ref/issue-5296-block-sticky-in-block-at-top.png b/tests/ref/issue-5296-block-sticky-in-block-at-top.png
new file mode 100644
index 00000000..ad0ace76
--- /dev/null
+++ b/tests/ref/issue-5296-block-sticky-in-block-at-top.png
diff --git a/tests/ref/issue-5296-block-sticky-spaced-from-top-of-page.png b/tests/ref/issue-5296-block-sticky-spaced-from-top-of-page.png
new file mode 100644
index 00000000..ad0ace76
--- /dev/null
+++ b/tests/ref/issue-5296-block-sticky-spaced-from-top-of-page.png
diff --git a/tests/ref/issue-5296-block-sticky-weakly-spaced-from-top-of-page.png b/tests/ref/issue-5296-block-sticky-weakly-spaced-from-top-of-page.png
new file mode 100644
index 00000000..9bcdbe56
--- /dev/null
+++ b/tests/ref/issue-5296-block-sticky-weakly-spaced-from-top-of-page.png
diff --git a/tests/suite/layout/container.typ b/tests/suite/layout/container.typ
index 799300f0..9948a00e 100644
--- a/tests/suite/layout/container.typ
+++ b/tests/suite/layout/container.typ
@@ -279,3 +279,28 @@ First!
 // Test box in 100% width block.
 #block(width: 100%, fill: red, box("a box"))
 #block(width: 100%, fill: red, [#box("a box") #box()])
+
+--- issue-5296-block-sticky-in-block-at-top ---
+#set page(height: 3cm)
+#v(1.6cm)
+#block(height: 2cm, breakable: true)[
+  #block(sticky: true)[*A*]
+
+  b
+]
+
+--- issue-5296-block-sticky-spaced-from-top-of-page ---
+#set page(height: 3cm)
+#v(2cm)
+
+#block(sticky: true)[*A*]
+
+b
+
+--- issue-5296-block-sticky-weakly-spaced-from-top-of-page ---
+#set page(height: 3cm)
+#v(2cm, weak: true)
+
+#block(sticky: true)[*A*]
+
+b