diff -r 16b607e9f714 -r 6331a6fc3304 mercurial/logcmdutil.py
--- a/mercurial/logcmdutil.py	Thu Nov 21 18:10:12 2019 +0100
+++ b/mercurial/logcmdutil.py	Thu Nov 21 16:48:34 2019 +0100
@@ -598,6 +598,7 @@
         # write changeset metadata, then patch if requested
         key = self._parts[self._tref]
         self.ui.write(self.t.render(key, props))
+        self._exthook(ctx)
         self._showpatch(ctx, graphwidth)
 
         if self._parts[b'footer']: