Prevent block spacing with placed elements (#2244)

crates/typst-library/src/layout/mod.rs

@@ -547,6 +547,7 @@ impl<'a> FlowBuilder<'a> {
         if content.is::<VElem>()
             || content.is::<ColbreakElem>()
             || content.is::<MetaElem>()
+            || content.is::<PlaceElem>()
         {
             self.0.push(content.clone(), styles);
             return true;

tests/typ/bugs/place-spacing.typ

@@ -0,0 +1,15 @@
+// Test that placed elements don't add extra block spacing.
+
+---
+#show figure: set block(spacing: 4em)
+
+Paragraph before float.
+#figure(rect(), placement: bottom)
+Paragraph after float.
+
+---
+#show place: set block(spacing: 4em)
+
+Paragraph before place.
+#place(rect())
+Paragraph after place.