--- a/Plugins/VcsPlugins/vcsMercurial/HgDiffDialog.py	Fri Jun 23 18:46:40 2017 +0200
+++ b/Plugins/VcsPlugins/vcsMercurial/HgDiffDialog.py	Sat Jun 24 12:15:03 2017 +0200
@@ -92,6 +92,7 @@
         
         self.contents.clear()
         self.filesCombo.clear()
+        self.highlighter.regenerateRules()
         
         if qdiff:
             self.setWindowTitle(self.tr("Patch Contents"))