fix: Newlines should be interpreted as paragraphs when pasting

closes #3421

shared/editor/plugins/PasteHandler.ts

@@ -30,6 +30,9 @@ function normalizePastedMarkdown(text: string): string {
   // find multiple newlines and insert a hard break to ensure they are respected
   text = text.replace(/\n{2,}/g, "\n\n\\\n");
 
+  // find single newlines and insert an extra to ensure they are treated as paragraphs
+  text = text.replace(/\b\n\b/g, "\n\n");
+
   return text;
 }