hgext/highlight/__init__.py

--- a/hgext/highlight/__init__.py	Thu Dec 12 14:28:31 2019 -0800
+++ b/hgext/highlight/__init__.py	Fri Dec 06 20:40:02 2019 -0500
@@ -52,7 +52,7 @@
     filenameonly = web.configbool(b'web', b'highlightonlymatchfilename', False)
 
     ctx = fctx.changectx()
-    m = ctx.matchfileset(expr)
+    m = ctx.matchfileset(fctx.repo().root, expr)
     if m(fctx.path()):
         highlight.pygmentize(
             field, fctx, style, tmpl, guessfilenameonly=filenameonly