🐛(frontend) remove comments from print

When we print a document, we want to hide
the comments and selection highlights. This is
done by adding some CSS rules to the print styles.

src/frontend/apps/impress/src/features/docs/doc-export/utils_print.ts

@@ -35,8 +35,10 @@ const PRINT_ONLY_CONTENT_CSS = `
   }
 
   /* Hide selection highlights */
-  .ProseMirror-yjs-selection {
+  .ProseMirror-yjs-selection,
+  .bn-thread-mark {
     background-color: transparent !important;
+    border-bottom: none !important;
   }
 
   /* Reset all layout containers for print flow */
@@ -299,7 +301,12 @@ export function printDocumentWithStyles() {
   setTimeout(() => {
     const cleanupLinks = wrapMediaWithLink();
     const cleanupInterlinks = wrapInterlinksWithAnchor();
+    let cleaned = false;
     const cleanup = () => {
+      if (cleaned) {
+        return;
+      }
+      cleaned = true;
       cleanupInterlinks();
       cleanupLinks();
       cleanupPrintStyles();