fix support for crossref callout

Author: cderv

src/resources/formats/typst/pandoc/quarto/definitions.typ

@@ -117,7 +117,12 @@
   // when we cleanup pandoc's emitted code to avoid spaces this will have to change
   let old_callout = it.body.children.at(1).body.children.at(1)
   let old_title_block = old_callout.body.children.at(0)
-  let old_title = old_title_block.body.body.children.at(2)
+  let children = old_title_block.body.body.children
+  let old_title = if children.len() == 1 {
+    children.at(0)  // no icon: title at index 0
+  } else {
+    children.at(1)  // with icon: title at index 1
+  }
 
   // TODO use custom separator if available
   let new_title = if empty(old_title) {
@@ -127,12 +132,14 @@
   }
 
   let new_title_block = block_with_new_content(
-    old_title_block, 
+    old_title_block,
     block_with_new_content(
-      old_title_block.body, 
-      old_title_block.body.body.children.at(0) +
-      old_title_block.body.body.children.at(1) +
-      new_title))
+      old_title_block.body,
+      if children.len() == 1 {
+        new_title  // no icon: just the title
+      } else {
+        children.at(0) + new_title  // with icon: preserve icon block + new title
+      }))
 
   block_with_new_content(old_callout,
     block(below: 0pt, new_title_block) +

tests/docs/smoke-all/typst/callout-no-icon.qmd

@@ -34,12 +34,14 @@ This is a warning callout without an icon.
 ## Tip Callouts with icon=false {#no-icon-tip}
 
 
-::: {.callout-tip icon="false"}
+::: {#tip-example .callout-tip icon="false"}
 
 A tip without a title and without an icon.
 
 :::
 
+See @tip-example
+
 ## Regular callout with icon {#with-icon-important}
 
 ::: {.callout-important}