--- a/mercurial/filemerge.py	Thu Mar 24 22:05:27 2022 -0700
+++ b/mercurial/filemerge.py	Thu Mar 24 22:05:36 2022 -0700
@@ -848,7 +848,7 @@
 
     props = {b'ctx': ctx}
     templateresult = template.renderdefault(props)
-    input.label_detail = templateresult.splitlines()[0]  # split for safety
+    input.label_detail = stringutil.firstline(templateresult)  # avoid '\n'
 
 
 def _populate_label_details(repo, inputs, tool=None):