--- a/eric6/Plugins/VcsPlugins/vcsMercurial/HgDiffDialog.py	Mon Oct 12 17:23:15 2020 +0200
+++ b/eric6/Plugins/VcsPlugins/vcsMercurial/HgDiffDialog.py	Mon Oct 12 17:39:45 2020 +0200
@@ -7,7 +7,6 @@
 Module implementing a dialog to show the output of the hg diff command process.
 """
 
-
 from PyQt5.QtCore import pyqtSlot, QFileInfo, Qt
 from PyQt5.QtGui import QTextCursor
 from PyQt5.QtWidgets import QWidget, QDialogButtonBox
@@ -51,8 +50,7 @@
         self.vcs = vcs
         
         font = Preferences.getEditorOtherFonts("MonospacedFont")
-        self.contents.setFontFamily(font.family())
-        self.contents.setFontPointSize(font.pointSize())
+        self.contents.document().setDefaultFont(font)
         
         self.highlighter = HgDiffHighlighter(self.contents.document())